The one on GunAuction looks like my GR3 in the pics, except for the engine turning. The one Pendelton is selling has been available for quite a while. He refers to it as a GR4/426E, but my 426E is coin finished. Similar, but not identical. Just guessing that the shortened barrels on the OP's gun reduced the value just enough to partially compensate for the Brileys. I'd say $800 if excellent condition and 12 gauge. Higher if a 20 gauge.