Congrats on a nice American sidelock.

The serial number dates to about 1915-1916. It had 32" Twist barrels. It sounds like a model 37, which would have been model 34 early on. It sold for $18.85 in the Sears big book.

In 1917 they stopped production and moved to a smaller facility. They continued to sell from inventory through 1919 while doing repair work.

Pete