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Waltham Grade No. 645 identifies a pocket-watch movement grade. The references available for this grade support a 16-size, 21-jewel movement; a documented example is identified as Model 1908. Those details help with identification, but the grade name alone cannot establish a particular watch’s case, setting, condition, value, or service needs.
What does Waltham Grade 645 mean?
“Grade No. 645” is the movement’s grade designation, not a complete description of every watch that may contain it. A Pocket Watch Database record for serial number 19002890 identifies that example as an American Waltham Grade No. 645, Model 1908, 16-size and 21-jewel. The record is specific to that movement, so verify the markings on the watch in hand rather than assuming every detail applies to every surviving example. View the Pocket Watch Database record.
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The National Association of Watch and Clock Collectors (NAWCC) master index also lists a Waltham Grade No. 645 movement and dial as 16-size and 21-jewel in Bulletin No. 372, published in February 2008. This corroborates those specifications, but the index entry is not a complete production history. Check the NAWCC Bulletin master index.
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Start with the markings on the movement itself. A collector reference describes an example as open-face and lever-set, but those details should not be generalized to every case or watch. Record the movement’s manufacturer, grade, model, size, jewel count and serial number, along with any case markings and visible setting details. Clear photographs of the movement and case markings can help a watchmaker or knowledgeable seller assess an inquiry.
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Do not infer a watch’s condition, value, production date range, or railroad certification from “Grade 645” alone. The references cited here do not establish total production, serial-number boundaries, universal case or dial configurations, current market value, or historical railroad certification. The NAWCC index entry is a useful specialist reference, not a complete grade history.
What should you tell a watchmaker?
When requesting an inspection or repair estimate, share the information that identifies the actual movement and describes the problem:
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- Manufacturer and the movement’s exact grade and model markings
- Size, jewel count and serial number
- What the watch is doing—for example, stopping, winding roughly or showing a sudden change in timekeeping
- Any known service history, impact or exposure to moisture
- Photographs of the movement and case markings, if available
These details help avoid treating the grade name as proof of the watch’s configuration or condition. Keep service invoices and records of any replaced parts with the photographs for future identification.
When should you stop winding or running it?
Have the watch inspected if winding feels rough, it stops, timekeeping changes suddenly, or you notice signs of moisture or impact damage. These symptoms call for assessment; they do not by themselves establish what is wrong with the movement. Do not force the crown, apply household oil, polish original surfaces, or open the case with improvised tools. The database’s care guidance is general advice, not a diagnosis of an individual watch. See the movement record and its service guidance.
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How should you search for Grade 645 parts?
A useful search phrase is “Waltham Grade 645 Model 1908 pocket watch movement parts.” A marketplace listing titled for vintage 16-size Waltham Grade 645 Model 1908 parts enumerates components including the balance, balance bridge, barrel, train bridge, cannon pinion, hour and minute wheels, center, third, fourth and escape wheels, pallet fork, pallet bridge, and winding components. The listing is on eBay, not evidence of Amazon availability. View the eBay parts search.
Listing a part by grade does not guarantee that it is currently in stock, in usable condition, or correct for your exact movement. Ask a qualified watchmaker to verify the part and movement configuration before you buy or begin a repair. Use the movement markings and serial number when checking fit; do not rely on a listing title alone.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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