I posted this on the Remington Society and A.H. Fox Collectors sites, but thought I'd do it here as well for some different eyeballs.
I was recently examining my CEO-Grade 135944 and comparing it to some pictures I have of 135970. On my gun the C on the barrels is stamped on the bottom of the web of the barrel lug and on 135970 it is on the barrel flat near the serial number (as commonly seen). Also there is an R under the serial number on the barrel flat of my gun. My barrels are engraved on top just like other higher grades of that era.
P135944 02.JPG
P135944 04.JPG
P135944 05.jpg
135970 CEO-Grade 10-gauge 05.jpg
Does any of this mean anything or am I making "much ado about nothing!"