Here's a quick tabulation of what's numbered and what isn't, and where:
Bolt Hold Open: Unnumbered
Take down lever: 81 - marked on bottom (visible in one of the photos above)
Safety lever: 81 - top
Safety bar: 81 - side (visible when engaged)
Trigger: 81 - left side on top, under cover
Frame: 3681u
Cover: 96 - inside with a big 1 on a different orientation and plane
81 - on bottom outside
Bolt: 81 - left bottom, eagle left top
86 - back
Ejector: unnumbered
Sear bar: 96 - left side
Firing pin and plunger: unnumbered
Extractor: 81
Grips, I didn't see any pencil markings on the back of them, nor did I see any numbers engraved or carved in to them.
The magazine was photographed previously; there are no markings I can find on the body, and it's a single-pin floorplate.
Any of this helpful?
If there's any other information anyone needs or could use, please let me know; I'll gladly photograph and/or transcribe what I see.