It may not have one. Rifles and shotguns made before 1968 were not required to HAVE a serial number (yes, it is legal. REMOVING a serial number is highly illegal) Many of the "hardware store" guns, such as the Western Auto Revelation, the Montgomery Ward's Wetsernfield or Sears JC Higgins guns were not serially numbered until 1968. PS- your gun is a Savage Model 94D, made for sale by Western Auto.
Savage
It' a Savage model 94D
Your model 350A was made by Mossberg for Montgomery Wards.The Mossberg model 350A was made from 1960-1968.The value will range between 40-160 dollars depending on overall condition and a good bore.
How much is a 16 gage single barrel shotgun model 350A Revelation
$100-$125, depending on condition.
value of revelation 12 guage 350 a
It's a Savage 94D
It is over 30 years that I know
The revelation model 350a is a single shot brake barrel 12 gauge shotgun that was mass produced by Stevens, and is actually a model 94. Its value ranges from $25 in poor condition, to $150 in mint condition. The gun has no collector value because it was produced in mass quantities.
Try e-gunparts.com
No sn data published that I know of
It's worth about $50.