^
+1

I also wish to add that the chrome on the outer cage plate on yours looks quite poor in comparison to most of the NRs or Records I've seen - looks like someone went over it with fine sandpaper - about the same finish of a Nuovo Gran Sport.

For that matter, the cage-wear photo is also a turn-off. Doesn't look good, and is also evident that the bike was ridden in small/small quite a bit - only way you can get outer cage plate wear.

Slightly smaller photos in better focus (and in a better order) would have improved things. Giving the main aluminum body a good polishing would have been sound advice for both your derailer and the auction preceding it - one can get a pretty nice shine out of these things.

That said, you got a pretty damn good price for a derailer that's 45+ years old. Could have just as well been worth nothing if there wasn't a collector's market. Don't be so all-fired greedy for profits, or you'll become just as bad as the Numbskullers Of The Day.

-Kurt