Hoyt,
Designations like this are pretty 'ad hoc', there is no real systemization and collectors use them pretty casually. Here is a listing of what occurs to me at the moment, its far from complete and I'm sure that other correspondents can add more.
HO = holdopen
BB = breechblock
bbl = barrel
GS = grip screw (not to be confused with the marking found on some Dutch Lugers)
Rcvr = receiver
FP = fring pin
TD = takedown/locking lever
Marking designations are a little more regularized.
c/[X] = a crown stamped over a letter e.g. c/N, the post-1910 commercial proof mark (two letters in the case of c/RC)
e/[X] = an eagle stamped over a letter or series of letters and numbers, e.g. e/6, e/WaA4 (sometimes the figure is a bird other than an eagle; sometimes the figure is so stylized as to be hard to recognize)
circle-s = an S inside a circle (sometimes the letter is not an S, and sometimes the figure is other than a circle, but the usage is the same)
--Dwight
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