Excel was a trade name used by HD Folsom Arms and Iver Johnson Arms and Cycle Works on shotguns made for Montgomery Wards.
Take it to a gunsmith
1893-1932
Under $100.
Depends if its damascus steel or not.
No published sn data
Yes.
Have it examined by a gunsmith
Before WW2.
Turn of the century, inexpensive arm.
What does this gun sell for?
50-100 or so
0-150 USD or so