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Date/Report Number …..110910.TY5FRE70.06 Item: WALTHAM   A.F.U.S. ARMY TYPE A-11 PILOTS MILITARY HACK WRIST WATCH
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Description of item: VINTAGE 1942 WALTHAM  A.F.U.S. ARMY TYPE A-11 PILOTS MILITARY HACK WRIST WATCH WITH ORIGINAL DIAL HANDS CRYSTAL SERRATED OYSTER STYLE SCREW DOWN CRYSTAL BEZEL. THE SCREW DOWN OYSTER STYLE CASE BACK SIGNED A.F.U.S. ARMY TYPE A-11 SPEC.NO. 94-27834-C SERIAL NO.A.F-45-420.0 MFR'S PART NO. 10616 ORDER NO. W33-038ac-8424 WALTHAM. THE HACKING MOVEMENT IS SIGNED WALTHAM U.S.A. 6/0 -B 16 JEWELS 32180 279. ATTACHED IS A G-18 NATO STYLE GREEN NYLON MILITARY STRAP W/BRUSHED KEEPERS. CONDITION IS EXCELLENT

Estimated Retail Replacement Value $ 590.00


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 Examination.
HISTORY

W.W. I I WALTHAM A.F.U.S. ARMY A-11 PILOTS HACK WATCH

In 1942 specifications were issued by the Army for a navigation hack watch designated the U.S. A.A.F A-11. The A-11 was more complicated than the B-1. The A-11 specifications called for a minimum 15-jewel movement and was put through a *program to meet certain standards of abuse tolerance and accuracy and was put out for contract with a much more detailed specification sheet. It represented the military’s acknowledgement that timekeeping was a critical element of modern warfare.

The A-11 hack watch was an AAF item issued to pilots and navigators and were worn to give the crewman an approximate timeframe for navigation, assembly times, etc.  Benrus, Bulova, Elgin & Waltham produced watches for the military, including the A-11, the renamed Army Air Force primarily utilized the Waltham A-11 with the 6B/234 specification of black dialing, white numerals and a hack feature.

A characteristic design distinction between the A-11 and the other 6B/234 Navigators watches was that it featured additional Arabic numerals outside of the minutes chapter ring to denote 10 minute increments

The "hack" nickname for the A-11 comes from the fact that when the winding stem is pulled out, the sweep second hand stops moving. It will start moving again when the stem is pushed back in against the case. The hack feature also meant that the seconds hand jumps from one second mark to the next, rather than moving smoothly.

Army officers and NCO's were issued wristwatches procured by the Ordnance Department. If a paratrooper officer or NCO had an A-11, they would have gotten it by trading for one or by some other means.

A-11's were not widely available and were closely controlled in the AAF supply sytem.

Throughout the war center-seconds remained the primary distinction between the Navigators hack watch and the basic military wristlet field watch, due to the added expense of indirect center-seconds.

The definitive Navigators hack watches of the Allied and Axis powers shared the same basic characteristics: Black Dial, White Arabic Numerals and Indices, White Hour, Minute, and Center-Seconds Hands; but adopted radically different sizing.

Both the US and England utilized the A-11.

By contemporary standards they were small watches, around 31mm, but highly legible.


*A-11 navigation hack watch performance specifications

From US ARMY SPECIFICATION NO. 94-27834-B, dated FEBRUARY 22, 1943 - WATCH, NAVIGATION, TYPE A-11 (HACK):

F. METHOD OF INSPECTION AND TESTS:

F-5. Individual Tests.- Each watch shall be subject to the following tests:

F-5a. Room Temperature Rate Test - Horizontal Position. - The watch shall be fully wound and run for one day to allow it to settle down. The daily rate of the watch then shall be determined for a period of 3 consecutive days with the watch in a horizontal position with the dial up and with a daily winding. The average of the daily rates during the test period shall not exceed 30 seconds.

F-5b. Room Temperature Rate Test - Vertical Position. - The daily rate of the watch shall be determined for a period of 3 consecutive days with the watch in a vertical position, with the pendant down and with daily winding. The average of the daily rates during the test period shall not exceed 30 seconds. The difference between the average daily rate obtained in this test, and in the test specified in Paragraph F-5a, shall not exceed 45 seconds.

F-6. Routine Type Test. - The following tests, in addition to those specified in Paragraph F-5, shall be applied to not less than 5 watches selected at random from each hundred or fraction thereof that are contracted for.

F-6a. Plus 35 Degrees Centigrade (Plus 95 Degrees Fahrenheit) Temperature Rate Test - Pendant Down Position.- The watch shall be fully wound and then subjected to a temperature of plus 35 degrees Centigrade (plus 95 degrees Fahrenheit) for a period of 5 hours. During this period, the daily rate of the watch shall not differ more than 20 seconds from the average daily rate obtained in the test specified in Paragraph F-5b. (In order to arrive at the correct figure for the rate allowance for the temperature test, the error noted for the 5-hour period shall be multiplied by 4.8 in order to determine the rate for 24 hours).

F-6b. Zero Degrees Centigrade (Plus 32 Degrees Fahrenheit)- Temperature Rate Test - Pendant Down Position. - The watch shall be tested as descrived in Paragraph F-6a, except that the watch shall be at a temperature of zero degrees Centigrade (plus 32 degrees Fahrenheit). The daily rate of the watch shall not differ more than 40 seconds from the daily rate obtained in test specified in Paragraph F-5b.

F-6c. Waterproof Test. - The watch shall be suspended above a beaker of water placed in a vacum chamber which shall be evacuated to 5 1/2 inches of mercury (to simulate a condition of 72 inches of water), then the watch shall be immersed for a period of 15 seconds. There shall be no evidence of leakage of water into the watch during the test period. Leakage will appear as bubbles emanating from the back, crystal, or stem of the watch.

 

BULOVA PROTESTING MILITARY BENRUS

MILITARY WATCH SPECIFICATIONS 1962