This is an authentic WWII aircraft navigator's ground speed stopwatch. Included is its original box. This is from the estate of a family member who was a navigator in WWII and it has been in storage for decades. It has been tested and it works perfectly.Most of the label on the box is legible (see picture) and it states the following. (Part of the number sequence is scraped off and it is difficult to make out the length of the number). Usage instructions: After winding, one press of the crown starts the second hand in motion.
As the hand passes 10 seconds, the small hand on the inner dial advances one mark on the scale and counts minutes. One revolution of the inner hand is 5 minutes, another revolution is 10 minutes. Another press of the crown stops the hands. Press again to reset to 0.Several different company's supplied the Air Force with these type watches. That description is below for those that. May be interested in these details. Type A-8, made by Waltham to Air Corps US Army spec #94-27749, with a serial # AF-44-8323. The below historic info is from Aeroantique which you can lookup online.
Sweetings book "Combat Flying Equipment". The A-8 was known as the jitterbug because of the loud and fast ticking of the balance at 144,000 beats per hour. The Type A-8 was a navigation stopwatch designed for timing ground speed meters for determining the velocity of aircraft relative to the ground. One revolution of the Type A-8 hand was equivalent to ten seconds.
The dial was white on early Wittnauer Type A-8 watches and black on Waltham watches produced from 1940 onwards. Elgin produced a Type A-8, 15 jewel, black dial stopwatch under military specification no. Waltham, the Federal Television Corp. Manufactured Type A-8 stopwatches under military specification MIL-W-6510 specification published in August 1951 and superseded No.
94-27749A published in July 1945. Under MIL-W-6510, continuous running movements were required to have not less than 15 jewels and the non-continuous movements were required to have not less than 9 jewels. The item "WWII US Army Air Corp Navigation Ground Speed Stop Watch HAMILTON WATCH CO" is in sale since Friday, November 12, 2021.This item is in the category "Collectibles\Militaria\WW II (1939-45)\Original Period Items\United States\Field Gear, Equipment". The seller is "garygary12345" and is located in Los Angeles, California. This item can be shipped to United States, Canada, Bahamas, Uruguay.