Heintzman Piano Upright

I have recently purchased a Heintzman Upright Piano. I have read previous questions about the serial number location trying to find replacement parts. I have not been able to find any serial number stampings on the frame. The only number is 1761 with a 2698 number below it. I am in search of a replacement hammer which is broken off. If you'd like to see photo's I'll happily forward them on to you. It seems to be an old upright as the wood work is quite old compared to the late woodworking workmanship.

Thanx in advance

Bill