Home Forums Hunting & Shooting Ask The Gunwriters Engraver Orville Kuhl? Rem Sportsman 48

I recently came to own this neat old shotgun. It is a Remington Sportsman 48 from 1950 (barrel code KWW) vent rib barrel stamped skeet with a polychoke and most unusually, custom engraving on the receiver. On close inspection the name “KUHL” can be found. In googling it appears an Orville Kuhl is a known engraver but little seems to turn up. Any additional information would be appreciated. About Mr. Kuhl, 11-48s (I’ve never shot one before) or other thoughts. There is something on the receiver, just in front of the second duck from the right, that did not come off with Hoppes no 9 and a flannel rag. Any ideas how best to clean whatever it is?
Thanks!