Those are 7 speed RSX levers...

The model number 712 implies that it came equipped with a 6 speed gruppo, not 7 (which is odd for a bike of this level in this model year anyway). This is definitely a bit odd...obviously someone could have modified the bike at some point, but the steel frame and model number just doesn't match up to the catalog.

Fanculito, are you in the US? The catalogs that are online, from which we get most of our information about models and specific years, are US/Nor Am market, and it's quite possible Miyata had somewhat different models/specs for other markets.
http://www.miyatacatalogs.com

Al - good thinking!

No, I'm from Belgium, Europe, you know, Eddy Merckx and stuff ;)

here's my friend's miyata seven twelve that i'm refreshening up: came with mostly shimano 600 sis 7 speed stuff on it. will be converting to an 8 speed shimano 600/ ultegra brifter on the right and dt shifter on the left.
http://bikeforums.net/attachment.php...hmentid=303287http://bikeforums.net/attachment.php...hmentid=303288http://bikeforums.net/attachment.php...hmentid=303289http://bikeforums.net/attachment.php...hmentid=303290http://bikeforums.net/attachment.php...hmentid=303291

I have a Miyata Seven Twelve in good condition. Anyone know how much it is worth? Please help.

Thanks

I´ve finally got a 712 and just like the threadstarter it has RSX100 7 speed components and have the same color. It also have a sticker with 100 down by the chain. Guess it also has to be a -90 or -91?

congrats on a great bike. currently own a 912 and a 312. you cant go wrong with these miyatas.