|Date/Report Number ..060109.TYHJY60G70.06 Item: WALTHAM MILITARY US 1917 H WITH 17 JEWEL WALTHAM 6/0 D PARKERIZED CASE|
|Description of item: VINTAGE
WALTHAM MILITARY US 1917 H WITH 17 JEWEL WALTHAM 6/0 D MOVEMENT IN A PARKERIZED STAINLESS
STEEL WATERPROOF CASE WITH G-18 NATO STYLE DESERT SAND NYLON STRAP
WITH KEEPERS CASE IS 31.46 X 41.55 MM, CASE SIGNED STAR WATCH CASE CO STAINLESS STEEL 2389176
Estimated Retail Replacement Value $699.00
|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.|
The terms Parkerizing, Parkerize, and Parkerized are all technically registered U.S. trademarks of Henkel Adhesives Technologies, although the terminology has largely passed into generic usage for many years. The process was first used on a large scale in the manufacture of firearms for the United States military during World War II.
Parkerizing (also called phosphating and phosphatizing) is a
method of protecting a steel surface from corrosion and increasing its resistance to wear
through the application of an electrochemical phosphate conversion coating. Parkerizing is
usually considered to be an improved zinc or manganese phosphating process, and not to be
an improved iron phosphating process, although some use the term parkerizing as a generic
term for applying phosphating (or phosphatizing) coatings that does include the iron
Parkerizing is commonly used on firearms as a more effective alternative to bluing, which is another electrochemical conversion coating that was developed earlier.
The Parkerizing process cannot be used on non-ferrous metals such as aluminum, brass, or copper. It similarly cannot be applied to steels containing a large amount of nickel, or on stainless steel. Passivation can be used for protecting other metals.
The process involves submerging the metal part into a phosphoric acid solution whose key ingredient is often zinc or manganese, with varying additional amounts of nitrates and chlorates and copper. In one of the many processes that have been developed, the solution is heated to a temperature of 190210 °F (8899 °C) for a period ranging between 5 and 45 minutes. A stream of small bubbles is emitted from the metal part as the process takes place; when the bubbling stops, the process is complete. In addition to this particular processing temperature, there have also been various similar Parkerizing processes developed and patented that permit using either lower temperatures (for energy efficiency) or higher temperatures (for faster processing).
Zinc phosphating results in a non-reflective, light- to
medium-gray finish. Manganese phosphating produces a medium- to dark-gray or black finish.
Iron phosphating produces a black or dark gray finish similar to manganese phosphating.
The grain size of the zinc phosphating is usually the smallest among the three processes,
providing a more appealing cosmetic appearance in many applications. Many firearms that
are Parkerized turn to a light greenish-gray color within a few years, as the coating
ages, with the protective coating remaining intact. Cosmoline, especially, interacting
with Parkerizing, can cause the highly-desired and attractive greenish-gray patina to
develop on firearms that are stored in armories.
Manganese and iron phosphating coatings are usually the thickest electrochemical conversion coatings, being thicker than electrochemical conversion coatings such as zinc phosphating and bluing.
None of the electrochemical conversion coating finishes are painted coatings, but chemically become part and parcel of the metal surface to which they are applied.
As for all electrochemical conversion coatings, the Parkerized surface must be completely covered with a light coating of oil to maximize corrosion and wear resistance, primarily through reducing wetting action and galvanic action. A heavy oil coating is unnecessary and undesirable for achieving a positive grip on Parkerized metal parts.
Alternatively, the Parkerized surface may be painted over with an epoxy or molybdenum finish for added wear resistance and self-lubricating properties.
DIAL CASE CROWN CRYSTAL
CASE IS 31.46 X 41.55 MM
THE THROUGH HOLES
ALLOW THE USE OF PINS
IF A SPRING BAR WAS LOST
THE NATO STYLE
G-18 NYLON STRAP
WITH THE COLORS OF THE DIAL
AND IS CLOSE TO THE COLOR
OF THOSE WATCHES WORN
IN NORTH AFRICA
IS NOT THE
OF THE WATCH
STAR WATCH CASE CO
stem wind and set
6/0 size, Do= 25.4mm, Dm= 24.7mm
f = 18000 A/h
power reserve 34h