I agree with this but that vintage should still be an excellent player . Mine is 243,xxx and it's been a great bari for me since 1998 .The higher the serial number towards ~250k the more the perceived value if it is really in excellent condition.
Agreed, that's why I used "perceived".Really, as long as it's keyed to high F and has the octave key on the neck, it's essentially the same whether called "New Wonder" or "12M", clear through till the front F gets added (around 1938 or so), and then it's the same again till the rolled tone holes go away (around 1948). From what I can tell other than moving one tone hole around to the outside of the bell (a fairly minor mechanism change), the baritone did not undergo a significant redesign from "New Wonder II" to "12M" in the way of the alto and (to a lesser extent) the tenor.
I think Mulligan's favorite Gold plated NWII (179K?) was 1926-27. I own a 1928 in original silver plate with engraving and condition that I is as good as it realistically gets. I paid $4.5K and I have not seen anything like it from vintage retailers and their prices these days are higher on anything remotely similar. I had offers in the $5K range when I entertained the idea of selling it. That said, for horn still in good shape but with work done and non-original finish, I have seen prices considerably lower for both NWII and 12M (pre WWII).Any speculation on the current value range for a '25 NWII bari? Lacquered, engraved with Conn logo only, excellent condition? Have not actually seen or played it yet...