But there are 3 numbers.... According to what I have ascertained.
You lift the cover, dial the right combination and then turn the cover to the right and you can unlock the lock. There also appears to be a switch on the back, likely to help set the combo to what you want. I do not see a date on the lock, just a long list of patent numbers on back. Last patent number coincides with...
Along with "Made in USA". The last patent date puts this guy around 1927... Coming up on 100 years old! Lock is 2 ¾ tall.
Had never seen this lock before or since. This item is in the category "Collectibles\Tools, Hardware & Locks\Locks, Keys". The seller is "imgoinfishin" and is located in this country: US. This item can be shipped to United States.