If you think some or all of the buttons may be from old avionics, as suggested in earlier posts, you may want to inquire on aviation boards. There might be some older pilots (or even younger ones who work in aviation museums), there who might recognize the parts.
I didn't see an appropriate public forum on landings.com or AOPA.org, but you could try posting an inquiry here:
https://www.partsbase.com/public/PublicMessageBoard/MsgBoardPublic.asp
