hello Alamar;
well, you could buy my book on them
here is the skinny;
a. check that the frame and all parts are eagle 6 marked (sometimes eagle 33)
b. check that the frame "stock lug" is eagle 6 (E6) or e33 stamped, there should be two of them
c. that the suffix is either 'a" or no suffix; anything else and it is a rework with a Simson replacement toggle
d. check that the proofs and acceptance on the right have eagle 6's in them (all depends on what time period they are proofed / accepted)
Biggest thing to remember (besides sending me the info once you look at it); is; is it a Simson, or a simson rework?
Going rate; at least 2k, for even a reblue. Add $500 for a matching magazine. I think a nice matching Simson is not going to be found for less than $2500, and I beleive their value is going to go up; there were only 12,000 of them made.
Ed