damaclac,
Welcome to the NAWCC Message Board!
The name Quincy Street doesn't ring a bell to me. It could be a model from a smaller company I am not too familiar with, a private label or contract watch (watch made by one of the usual manufacturers but marked with the name of a jeweler, a RR inspector or an individual), or possibly a Swiss fake (watch made to imitate an American watch that was popular at the time). Either way, a picture of the movement would be helpful. If you need assistance posting it, just send it to me and I'll post it for you. My email address is availble by clicking the 'mikeh' at the top of my response.
To research your Elgin watches, try using elginwatches.org (you can't link there from this site so just enter elginwatches.org preceded by www. into your browser's address bar). Once there, use the Elgin Databases link, then the Serial Number Lookup link, both on the left side of the screen. This won't help for your Quincy Street, but you'll find lots of Elgin info there.
I looked them up and found that two are keywinds, one 11 jewels and one 15. They are both from the 1870's and 1880's. The last one appears to be a 21j Veritas or BW Raymond, either of which would have been considered RR grade watches. There is much more information available at the site mentioned above.
I've never seen anyone repair a broken hand. If it is still in one piece, it can usually be refitted. If not, a replacement can usually be found fairly easily.
Feel free to continue this thread with any other questions you might have.