Hi Fooles,

Pull off the string anchor cover. Some of the harps had a model number stamped in the wood under there. Also look carefully through the sound hole at the label. Some models were ID'd there as well.

I seem to recall a time when the 15 bar harps had the same type of chord bar cover the 21 bar Harps had. This was for a short time.

The buttons you described sound more like 21 bar buttons than 15 bar buttons. And the springs are a pain.

Don