One other tidbit, however, is that the first clock you described case serial number , movement number has the highest case serial number yet identified with a corresponding movement serial number. The next example in our records has a movement serial number of , with no case serial number. There is some evidence that JLC may have skipped a group of movement serial numbers in order to keep their factory records in sequence when they switched to just having the serial numbers on the movement at the end of or early Prior to the clock with serial number their records are known to have been kept by the serial number on the case and not the one on the movement so it would be a logical choice to skip a group of movement numbers in order to maintain sequential records.
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In they went the other way and evidently moved the serial number from the movement to the case without breaking the sequence, where it remains today. Thanks John for the additional information.
Call the U.S. Naval Observatory for the correct time at: 202-762-1401
There's so much more to know about Atmos clocks than I realize. You must log in or sign up to post here.
Share This Page Tweet. Most Atmos clocks are "graded" by using the following guidelines: Excellent Condition - Clock runs perfectly, the finish is bright and clear with only a few minor hairline scratches that are noticeable only at close inspection. MINT Condition - Clock runs perfectly; case is in perfect condition, no fading and no highline scratches-even at very close inspection; often original box, packing material and documentation included. A good way of determining the approximate value of your particular clock is to regularly visit on-line Auction Sites; look for clocks at auctions similar to yours, comparing your clock to identical ones with the final "winning bid amounts".
Marina Atmos Clock
A number of documented examples have shown that in the early days of the Amos production by JLC the transition of one model to another is not clearcut resulting in clocks having features of the two transition models. In the case of your clock it has many features of the calilbre model, fitted with a movement of a later calibre having a narrower movement plate.
Do all calibre 's have movement plates 50mm wide?
If so, what would be my calibre model? Mun, thanks for posting the differences in plate dimensions between calibre numbers.
Antiques Atlas - Marina Atmos Clock
I would like to amplify on what you have posted. Firstly, even though in "Living on Air" it states that no calibre number was assigned to the movements used for the Atmos II, in fact these movements are physically identical to the calibre 30"A used for the Atmos I, the main difference being the escapement fork. Although I have not made a comprehensive test I have been able to interchange parts between calibre 30"A movements and the Atmos II movements without problems.
Secondly, you did not mention that the calibre is Atmos III. Atmos III clocks included both the 50 mm wide plate calibre and the 45 mm wide plate calibre From my data the calibre was made first starting in June , and the calibre was introduced in late and continued to about mid when the calibre Atmos V was being developed. I believe that GB's clock is a calibre Atmos III, even though there seems to be a 1 mm discrepancy in the measurement of the plate.
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Similarly, the calibre Atmos IV with 50 mm wide plate changed to calibre with a 45 mm wide plate at the same time the Atmos III was changed from calibre to calibre All this coincided with the introduction of the calibre Atmos V, as reported in "Living on Air" in a discussion about commercial production of the Atmos V which was realized in June Hello and Good day, I just picked up a new digital caliper and remeasured the sub-frame. It is precisely 45 mm. I guess I will be correct in calling this an early calibre model I have attached a photo. I thought I looked over every square inch of the clock.
Atmos Clock Identification
I should have been looking at every square millimeter!! Thanks for your professional assistance. You must log in or sign up to post here.