David,
Your comment about checkering sent me to the safe. My favorite in the "stable" is an OE 20, untouched, and has pointed checkering! Being curious I pulled out both my OO's, a 20 extractor gun, and a OOE 16--both original-- and both have pointed checkering.
I'll have the OE 20 at Sanford for sporting clays--remind me to show it to you.
Dick