[saxophender]

I would think a Bundy neck would probably work.

 

[saxophender]

Its serial puts it in the middle of 1918…

Elkharts have their own serial numbers. The usual Buescher serial number chart is not accurate for these. It is not nearly that old.

thats a 1960,s built horn

It's not that new either. According to the extensive research done by @badenia, Buescher dropped the Elkhart brand in 1958. The "Built by Buescher" engraving was introduced in 1950. Therefore this sax should be from the 1950s.