Re: Vintage sax
The patent date represents a horn manufactured by C.G. Conn.
Your pic tells us nothing except that it is what is considered a stencil horn made by conn, so some other company paid conn to have the engraving "stenciled" on the bell.
Normally Conn would use the remaining inventory of parts from their last replaced madel as parts fpr a stencil horn. The picture shows straight tone holes as opposed to the 1923 to 1948ish rolled tone holes used by Conn, so I am going to assurme your horn is a primitive horn prior to 1922 and is probably a C melody.
Value is low, below 250 bucks.
More pictures of the horn itself could tell more.