A little help, please?

[Phil Bondi]

I'm trying to find out the age of a Knabe square-back Grand - 5'2" with no visible
serial# in the usual places..there is a 4-digit number on the far wall of the
key bed cavitiy that looks like it might be a serial#..the number is 8068.

I'm not at my office..otherwise I would look that number up myself..

..any help is greatly appreciated.

thanks,

Rook