FA: Crystal calibrator circuit board w/crystal on Ebay
 

http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3050838644

Nice little circuit board - probably Yaesu, but can't be sure. Comes
with a Yaesu 100kc calibrator crystal and schematic for the circuit
board. Single transistor circuit on small board. Easy fit into most
any receiver without any need to modify the chassis.