About a 1924/1925 mfg.
Featherweight frame (as opposed to the 'regular frame')
Ser # should have FW prefix to it on the action flats.
It'll have FWE (E for ejectors) if it so featured, but I don't see them in the pics.
Small bore SxS's (16, 20, 28 & 410) bring a premium over the 12's. Condition dictates value like every other firearm. The shotgun has lost it's case color frame finish, so collectors wouldn't be interested. Though there are several restoration businesses that will re-do the gun for you at a price that'll exceed the finished value!.
The replaced butt plate and grip cap would also turn the true collectors off. Don't take that as a tire kickers slap at your shotgun, that's just how a certain segment of the market would look at it. The butt plate needs a bit of trimming and finishing to complete the fit.They are nice compliments to the stock and shooters appreciate them better than a squished out old brittle pad hanging on there. Keep that old grip cap even though chipped and pass it along or at least offer it to the next owner if the gun is sold.
If the bbls are original length (un-cut),,and that is a Big Deal in the SxS world in terms of both $$ value and simple desirability, the gun keeps a lot of it's worth.
The small dent in the bbl is common and not big deal. MAny are shot with them like that, easy to remove though by a 'smith with the right tools and know how.
The gun may have the shorter 2 9/16" chambers common from that era in 16ga. I don't remember the exact change over date on LCS to 2 3/4 for 16ga,,if there even was such a date.
Plenty of the short chambered guns get shot hand have been with 2 3/4" shells for the last 80+ yrs. But you can buy 2 9/16" shells right from RST and others now and have them sent to your door if that's what you need.
Good mechanical shape,,safety works right, no stock cracks, uncut bbls,guns locks up tight , not 'off face', no bore pitting that looks like moon craters, matching ser#'s on the frame, bbls, forend assemblys,,ect, ect.
A shooter 16gs LCS like that (not much orig finish and a few alterations but nothing major would be in the $800 +range IMO.
Perhaps the 1K mark could be reached if the right buyer was found and in the right area where shotgunning and vintage SxS's are popular as well.
If it had or does have ejectors,,then it's a $1200 to $1400 gun in most places with everything else staying the same.
just my 02.