Re: My Grandpa's Alto Sax
Dave is correct. Technically, it would be considered a transitional model, but most likely it is an early 6M. They were not officially called a 6M until 1934. Conn started making changes to their New Wonder Series II as early as 1928. The New Wonder had the split bell keys (B and Bb keys on opposite sides of the bell). I would imagine that your horn has the keys on the same side, and probably an underslung octave key also (octave key mounted on the bottom of the neck instead of the top). The engraving is also typical of the later 6M's. It's rare to see that same engraving engraving on a horn made before 1934.
$2000 is a good average value. In excellent shape with original lacquer, I've seen them sell for as much as $2800. It's true relacquers are generally worth less than a horn that has 90% or better original lacquer, but if the relacquer is done properly, a relacquered horn is worth no less than a vintage horn with, say 80% original lacquer. I have had a couple of my horns relacquered. If the original lacquer is less than 70%, I would consider a relacquer. Just be careful who you have do the work!