A SxS in useable but not like-new condition will bring between $100 and $250. A 20 gauge or .410 will be in the mid to upper part of that range and a 12 or 16 gauge in the lower to middle part.
How old US a Stevens savage model 530a 16 gauge
about £120
The stevens model 9478 shotgun was made between 1978-1985.
Just another model in the Stevens line.
Whats it worth?
$75 to $125
it's a 12 gauge shotgun that with pump action feed.
Your Stevens model 77C was made from 1955-1971.
Stevens 947y This shotgun is a Savage 940,940Y,or 940B
$17 in good condition
About 20 years old
200,375