Charlie Petry wrote: <I have a PUCH with ASTRO DAMILER on the down tube looks like a slightly blackish chrome finish on the frame stickers on the fork+frame (not all there) looks like Maganese Alloy Tubes - is this 531?>
Charlie,
You have the Vent Noir II with the dark chrome finish, late '70s or early '80s. It should be all 531. There should be a lot in the archives but if you can't find anything, contact me off list. I've become quite a fan of AD since I bought a Vent Noir (flat black) frameset, the extra long top tube fits my body frame size perfectly.
Regards,
John Wilson
Greensburg, PA