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OMTOM
·I am hoping that somebody can help me with info on the Waltham size 37 movement. This was a two-barrel 8-day movement which seemed to have started with 7 jewels and later versions had 15 jewels.
I think it originated fairly early in the last century – and was still being used in WWII. Used on lots of travel clocks. It seems better versions were used in deck watches/ship’s chronometers.
I have found the (Olof Ohlson) patent for the movement which dated 1912 – but I don’t know when Waltham first produced them. It seems the movement was used in a watch model 1910 – but I think that was the model number, not the year.
I show a rather tired version (only to illustrate what I’m talking about).
Here are the questions I’d like to ask:
1. What year was the movement first produced?
2. What year did they change from 7 to 15 jewels?
3. In what other ‘models’ was the movement used – apart from the model 1910?
4. All the examples I have found were stem-wound. Was there also a version which was key-wound (for example for larger desk or shelf clocks)?
I think it originated fairly early in the last century – and was still being used in WWII. Used on lots of travel clocks. It seems better versions were used in deck watches/ship’s chronometers.
I have found the (Olof Ohlson) patent for the movement which dated 1912 – but I don’t know when Waltham first produced them. It seems the movement was used in a watch model 1910 – but I think that was the model number, not the year.
I show a rather tired version (only to illustrate what I’m talking about).
Here are the questions I’d like to ask:
1. What year was the movement first produced?
2. What year did they change from 7 to 15 jewels?
3. In what other ‘models’ was the movement used – apart from the model 1910?
4. All the examples I have found were stem-wound. Was there also a version which was key-wound (for example for larger desk or shelf clocks)?
