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
Depends if its damascus steel or not.
No published sn data
Have it examined by a gunsmith
Turn of the century, inexpensive arm.
does this gun sell for?
50-100 or so
0-150 USD or so