Cindy, yours is from 1902. The F Grade was the lowest priced hammer gun made. A Catalog of 1906 states" With Royal Steel barrels, $20.00, for Best English Stub Twist, $23.00 and for Good Damascus, $25.00.
Your gun would have a 3 pin 1 screw back action lock. The bridle to yours in the Parts Diagram is the first #4 (long bridle) and it encapsulated the mainspring, the area for the mainspring was not milled in the lock plate to hold the mainspring. Hammer would be #15, extractor would be #9 and mainspring would be #19.
The top tang on yours would be stepped, and not tapered like the ones in 1907. This style was made from sometime in 1899 after serial number 73,000 to 1906 ending in serial number 149,999.
I hope this has helped you and be free to ask any questions.
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