An RS .280 in my opinion would be a super find!! Really, I seem to hear of more of the 77V Varmint version in .280, then an occassional 77R.
But sights on an M77 is a special treat because only a small percentage of M77's had sights.
The next thing is, some of the .280's are marked ".280 REM. or 7mm Remington Express" I believe is what they say, which is another special collector interest.
If you see that one again, be sure to let me know the sn (
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Looking at my notes, I have them noted only in the 74-62086 to 74-66247 range.
Chet15