I just picked up a rear N.R. derailleur with "Patent", no date, stamped on top. The cage spring housing stop is brazed to the housing, rather than cast in. The piece appears to be fully functional, but the bolts & logo plate are scuffed. I'm wondering if it would be worth replacing the cosmetically rough part of the parallelogram with a perfect one from a later derailleur, or whether there is some sort of value to leaving it as is. Also, does anybody have experience driving out the steel pivot pins? Before I whale away at the poor innocent thing, I'd love to hear from somebody who been successful at removing them. If you've been unsuccessful, that might be a lot more interesting to read! Michael Shiffer EuroMeccanica, Inc. 114 Pearl Street Mount Vernon, NY 10550 (914) 668-1300 euromeccanicany.com