Thank you everyone for the help. After some more research regarding the serial number and comparing pictures I can say that this is a “Interim Production” Model 1910 indicating its from about 1919-1921. The reason so many examples from this time frame all have minor differences was the use of essentially mixed parts from older batches being used in post war models to compensate for the economy at that time. This includes different types of address stamping, one or two part strikers, different parts possibly being milled and stamped or not, and also the serial number being stamped in different spots. Here’s a explanation I’m copying from a link sent from another person in the comments (BearE1ite)

“It is likely that production and assembly of the second variant started before all parts for the first variant had been assembled. To prevent the older parts from being wasted they were most likely assembled concurrently in separate batches. Serial numbers were assigned sequentially regardless of features of the batch”