Mike, thanks for posting the pictures of this wonderful lock. Another time lock of the same series was posted in a thread a few days ago. That was a Model 4 and this a Model 3 S&G and i have to say that its quite frikkin amazing to find two of these beautiful locks on the board, posted the same week! Congratulations finding this extrordinary piece of machinery!
How old? How many were made? What’s it worth? Is there a way to track the history of this particular one? Are any of these locks still in use today?
The Model 3 was being made to around 1925 and was bigger than but probably as secure as the Model 4. The industry standard for time locks was set at 72 hours in 1880 which is why im guessing you lock to have been made from 1880s to anywhere around 1920. Earlier series of this model would have been easier to pin-point to a more exact age, but i dont have more to go on with yours. Im guessing around 500-1000 of these were produced.
However, what you have there is a rare piece. You should count yourself very lucky to find one of these since you have the entire lock intact- window n all, and since you have one of the 72 hour-movement locks which were manufactured from 1880 to at least 1921, Im guessing maybe about 19 of these are still left not counting with the one you posess 😉 . Im not at all shure, but thats my guess.
Again, thanks for sharing it with us!