A) Funny mistake!
B) I stopped pointing out mistakes like that, even though I still snort at them, because of how many mistakes I make myself.
C) That is an early production Raven with the first type of safety catch (they used three or four different ones). It was odd in some way, like working the slide automatically put the gun on safe or something. If you've got a copy of J.B. Wood's "Troubleshooting Your Handgun", he describes it there.
D) This gun is from the early 1970's, I think, so it is about 50 years old. People are getting interested in collecting them, because they are old, cheap (relatively speaking), American, and an odd part of firearms history. Remember when Spanish-made pistols from 1905 to 1935 were worthless junk? Check out the asking prices on them now.
E) I still think the seller dreaming by asking $200, but I am old enough that $200 seems like pretty good money to me, so who knows?