Impossible to answer without a detailed description of all markings.
when was a cil 12 gage shot gun made model 402.
Provide a DETAILED description of ALL markings on the weapon.
This was sold by Sears , made by Stevens between 1912 and 1942. It was not made by Browning.
Can't be answered without knowing who made it, all features and condition
You have stated what you have, not asked a question.
Follow the instructions from the manufacturer.
Blue Book of Gun Values will help.
Post the serial number of the gun and I'll let you know.
It may not have one. Rifles and shotguns made prior to 1968 were not required to have serial numbers.
There were several companies who made Montgomery Wards guns but most of them were made by Mossberg or Savage. Either way, if the gun is in reasonable & shot able condition, it is worth between $100.00 & 150.00 to a dealer.
50-100 or so
all depends on the load it varys
Gun shops, gun stores, pawn shops, library, on line auctions.