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  1. grtnev

    Survey: Waltham A13A Aircraft Clock

    A few more notes on this clock: 1. The clock will run for 8 days, but to improve accuracy, should be wound at least every 4-1/2 days or daily if possible. 2. From MIL-C-6499E; 7 July 1970; "Military Specification Clock, Aircraft, Mechanical, Type A-13A" The clock is tested under the...
  2. grtnev

    Survey: Waltham A13A Aircraft Clock

    Jim, I kind of think it is the A1 variant as well, but if the hands and dial numerals were luminescent I don’t see any evidence of it now after being under a bright light for several minutes. I’ll know more when I get around to having it cleaned. Richard
  3. grtnev

    Survey: Waltham A13A Aircraft Clock

    Quoting from pages 28 and 34 of Whitney: "The military specifications MIL-C-6499 defined this timepiece as an unlighted mechanical aircraft clock having a 1-7/8 inch dial and a one-hour elapsed time capability. There were two types: a. Type A-13A-1, having fluorescent luminescent hands and...
  4. grtnev

    Hamilton Model 22 Chronometer Watch - Dial Question

    Thank you all for your responses. Been very helpful and informative. The dial will remain as is. If it ain't broke, don't fix it. Richard
  5. grtnev

    Hamilton Model 22 Chronometer Watch - Dial Question

    Jim, Thanks for the responses - I am going to leave it as is - I like the patina if you will., The serial number is 2F22218. The Hamilton Ledger page is attached. This Model 22 was finished on 7 Dec 1945 and sold on.......well that is confusing, at least to me. There are 12 (if I counted...
  6. grtnev

    Hamilton Model 22 Chronometer Watch - Dial Question

    Is the discoloration due to sunlight or ....?
  7. grtnev

    Hamilton Model 22 Chronometer Watch - Dial Question

    I recently acquired the Hamilton Model 22 Chronometer Watch shown in the pictures. It is ca: 1943. I have seen several of these that have discoloration of the dial similar to as mine and as can be seen in the first two pictures. Then again, you'll see these at times with almost NOS looking...
  8. grtnev

    Hamilton Model 23 Chronograph

    Dano, Pretty neat deal to say the least - your watchmaker is a very good friend indeed. Richard
  9. grtnev

    Hamilton Model 23 Chronograph

    Dan, A very nice acquisition indeed. In addition to Jim's comments, here are a few "cliff notes" from various sources that I collated into a couple of paragraphs when I picked up a Model 23 a couple of years ago. Richard "The Hamilton Model 23 Chronometer was used by all branches of the...

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