.
Welcome to TFL !
Stevens made several different tip-up models, between 1864 & 1935, so a REALLY thorough description and/or pics would most likely help determine what you have.
BTW - Please don't even think about exactly when your was made.
There are NO factory production records surviving, so the best some Stevens-knowledgable folks can do is to quote an approximate range of when the particular model was known to have been introduced and/or discontinued.
.