Basically your gun is a Mossberg 385 series bolt-action 20ga shotgun private-branded for Western Auto. New replacement magazines are available, just need to know if your gun is 2 3/4" only or accepts 3" ammunition.
It may be difficult to find a 2-shot clip for a Revelation Model R325BB as it was not designed to use detachable magazines. However, you may want to try contacting gunsmiths or firearm parts suppliers for assistance in finding a compatible solution.
I bought a Revelation R325BB in very good shape a few weeks ago for $65. It appears to have been rarely used.
From the best I can tell, the Western Auto 325BB model was made by Mossberg.
No sn data available in the public domain.
Springfield
mossberg
About $75.
Kalishnikov
Marlin manufactured the Revelation model 200. Thanks and what was the model number they used ?
45$
What MODEL of rifle? There were several sold under the Revelation brand. Different makers, different values.
Proofhouse.com has a store brand chart.
25-175 usd