Re: C.G Conn
That is from around 1925 ish.
It is a C Melody. Many were made.
But, they stopped making saxophones in the key of C around 1930.
Now they are made in B flat and E flat. There is not much demand for a C sax today, but there is a following.
Your Conn C melody has all the "bells and whistles" of the time, so I consider them the best of the C melody examples.
You can pick one up in pretty good condition for around 250-300.
It will cost a good 500 to 800 to make it sing like new.
Nice refurbished examples sell in the 1000 to 1500 range.
Condition is everything. There are many of them out there.