It may not have one. Rifles and shotguns made prior to 1968 were not required to have serial numbers.
Try e-gunparts.com
$100 for a pretty beat up one
It was made by Stevens, the model is: Stevens model 940
Serial numbers were not required prior to 1968.
This was sold by Sears , made by Stevens between 1912 and 1942. It was not made by Browning.
50-250 or so
I can say that Stevens began production of the model 94 single shot shotguns in the year 1929.and finished in the year 1945.
$50-$100, depending on condition.
not sure check sears
Post the serial number of the gun and I'll let you know.
50-500 usd
No published sn data