I found an old soprano sax at a yard sale and I'm wondering if somebody out there might be familiar with it and know if it's worth buying. Of course I can't find the paper I wrote the numbers on but... It was a silver curved soprano horn that clearly said "Commonwealth" on the bell. I couldn't see any other names on it. It clearly said 1915 on the back of the horn where the serial number and a model number (lost sorry) and an S and a L (I think). The keys all worked cleanly but it definitely needs new pads. The seller was asking $90. Would it be worth it as an investment or a keeper?