Elkhart Conn Price Lists?

[pjanda1]

I'm having a conversation with a friend about some crazy depreciation in a particular professional woodwind instrument. I was musing about the lack of depreciation I perceive in my collection. While I've seen prices on very old Conn catalogs, later ones don't seem to have them. If anybody can point me toward an MSRP lists for the later Elkhart years (60s), I'd be grateful.

Paul

[SteveM]

This might be a good resource -
https://www.saxophone.org/museum/publications/id/324