Ken, You might want to go here - you might get lucky: http://www.zerobeat.net/qrp/k2data.html It's an Elecraft Owner's Database maintained by Thom LaCosta. Maybe the previous owner/builder posted the serial number there. 73 de Larry W2LJ -- Larry W2LJ QRP - When you care to send the very least! http://www.qsl.net/w2lj http://w2lj.blogspot.com/