GSW PO BOX 2301
SUWANEE, GA, USA
30024
www.goldsmithworks.com
770.831.1257 - 1.800.438.6894

Date/Report Number:.111814:EGST-AF43-3322 Item:  1950-1953 *RADIUM ILLUMINATED
COLUMBIAN BULOVA
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Description of item:  VINTAGE KOREAN WAR ERA BULOVA 31 X 38 MM W/O CROWN WITH FIRST EDITION FACTORY HACK SUB SECOND TO SWEEP SECOND BULOVA 10 BCC [SWISS AS 1200 BASE] 15 JEWEL
MANUAL WIND MOVEMENT

Estimated Retail Replacement Value $549.00


Reports are supplied at the request of the customer and it is for the customer's exclusive use. Reports express an opinion of the time of the examination of the jewelry. This report is for customers use only for the following two purposes, indicating estimated retail replacement value to obtain insurance coverage, or for the purpose of providing geological information. goldsmith Works does not guarantee that the appraisal valuation will result in a sale at the price. Estimated retail replacement value is arrived after analyses of what the approximate high retail cash asking price is for labor, materials, and design. These prices may be substantially higher than actual transaction or warranty with regards to any item described in the report, since jewelry grading is not an exact science, this  report represent the best opinion of the company. GoldSmith Works is in no case responsible for differences that occur by repeated grading by other experts in the field and/or use of other standards, norms, methods or criteria other than those used by GoldSmith Works. GoldSmith Works is expressly held harmless by customers including, but with out limitation for any claims or actions that may arise out of negligence in connection with the preparation of this laboratory report, or actions based upon the customer's use of the report. The information on the carat weight, clarity grade, color grade on the report is approximate due to the limitations in jewelry grading. The item was tested, graded, and examined under 10x magnification using the techniques and equipment available to GoldSmith Works, including fully corrected triplet loupe, binocular microscope, master color comparison guides, diamond color comparison tools, electronic carat balance, non-contact optical measuring device, and ancillary instruments necessary at the time of Exam

 

 

 


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1950-1953
*RADIUM ILLUMINATED
BULOVA


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24 HOUR DIAL

*RE-ILLUMINATED WITH LUMINOVA

31 X 38
MM
W/O
CROWN


WITH

FIRST EDITION
FACTORY HACK
SUB SECOND TO SWEEP SECOND
BULOVA
10 BCC
[SWISS AS 1200 BASE]
15 JEWEL

MANUAL WIND
MOVEMENT

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OLIVE DRAB NYLON NATO
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AWESOME
STRAP
DIAL
HANDS
CASE

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DO NOT TAKE MY WORD
USE YOUR EYES

 

IMG_2423.JPG (111766 bytes)MATT WHITE DIAL

BLACK SWEEP SECONDS CHAPTER RING

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RE-ILLUMINATED RAISED NUMERALS

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ORIGINAL HANDS

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ORIGINAL
GOLD STEEL HANDS
DIAL RE-ILLUMINATED
WITH
AF-LUMINOVA

HIGH-PERFORMANCE
PHOSPHORESCENT PIGMENT

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OLIVE DRAB

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OLIVE DRAB

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OLIVE DRAB

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CASE BACK HAS   A US
  COLOMBIAN EXPO HALF DOLLAR
IT MAKES REMOVING CASE BACK A BREEZE

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ILLUMINATED!!!!!!!!!!!!!!!

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CASE IS IN EXCELLENT ORIGINAL CONDITION

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CASE WAS ELECTRO CLEANED
THEN CENTER AS SHE WAS
NEW CRYSTAL
ORIGINAL CROWN


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SIZE IS NICE
THIS BULOVA KOREAN WAR ERA

1950-1953
IS

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AS YOU CAN SEE
THIS STUNNING BULOVA CASE HAS VERY FEW
MARS. AND THESE ARE AT HIGH MAGNIFIED RESOLUTION

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OLIVE DRAB NYLON NATO


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CASE AWESOME

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OLIVE DRAB NYLON NATO

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CROWN IS ORIGINAL

 

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OLIVE DRAB NYLON NATO

NOTE THE COOL

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COIN CASE BACK



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FITS UP TO 9


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AWEEEEEEEEEEEESOMEEEEEEE

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HERE ROCK IS SEALING CRYSTAL
WITH UV CEMENT
THE UV LIGHT HARDENS THE UV CEMENT

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A LOOK AT PARTS READY TO ASSEMBLE

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AWESOME TALKING POINT
IN ADDITION TO THE WATCH ITSELF

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ANOTHER SHOT
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MORE

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...............

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SIGNED CASE


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HANDS RE-ILLUMINATED

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NEW RUBBER SEAL

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10BCC
THIS IS FIRST EDITION WITH HACKED SWEEP SECONDS
THE WATCH MOVEMENT WAS FACTORY HACKED
TO ALLOW A SUB SECOND MOVEMENT BECOME SWEEP SECONDS
THE NEXT 10BCC HAD BUILT IN CENTER SWEEPS
NO LARGE WHEEL ON TOP

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Features
manual wind
sweep second

Data
10.5''', Dm= 23.3mm
H= 4.0mm
T= 2.0mm
15/17 jewels
f = 18000 A/h
power reserve 43h


WWII
CENTER SWEEP


Prior to WWII, most watches had a sub-second register above the #6 position. This design failed to allow precision seconds timing. The sub-second style dial, with a tiny second hand rotating around a tiny seconds register at the 6 position, was difficult to utilize for timing events. In most cases it was ignored. On the other hand, a sweep second hand could be used to time events, mark events, and was easier to read .

By 1942, the sweep second hand watch had became "the" watch. Two of the major reasons were the Government issued U.S.A. A-11 hacking sweep seconds pilots watch and the sweep seconds watches in demand by Doctors, Medics and Nurses and other professionals.. The sweep second watch simply made the watch more than an instrument to "tell time"....

THE DESIGN

So, what did Pierce and others do?

Did they re-tool and re-design new movements? NO!

They simply placed a hollow canon pinion that allowed a wheeled center shaft to protrude through the dial, mounted a second hand to it, and ran the combo with the very sub-seconds wheel they were eliminating...

 

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gsw/mwb/gsww archive photo

 THE 10BCC IN THIS WATCH IS A FIRST EDITION WITH HACKED SWEEP SECONDS THE WATCH MOVEMENT WAS FACTORY HACKED TO ALLOW A SUB SECOND MOVEMENT BECOME SWEEP SECONDS THE NEXE 10BCC HAD BUILT IN CENTER SWEEPS NO LARGE WHEEL ON TOP

Instead of the drive train turning the dial protruding shaft/pinion at 6 position connected to the tiny second hand, they mounted a large brass/alloy wheel on the opposite side of the shaft that now protruded through the bridge. That wheel turned a wheel on top of a NEW center "shaft' held in position be a new this jeweled bridge that went through a new HOLLOW center cannon pinion in the center of the movement that then protruded through the center of the dial where a new long sweep second hand attached;  the idea being that one had a large second hand that went round in tune with the movement and the chapter ring so one could count, time & now even synchronize.

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CONDITION
- EXCELLENT- 
WATCH WINDS SETS & KEEPS TIME
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**

 

 

 

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