I'm gonna say "Mavic rear derailleur". I've never seen one like in the picture, but the barrell adjuster looks just like one that I had on a Mavic. I'm gonna say early 80s, because everything that they made by the mid 80s had their name all over it.

It looks like an Ofmega "Mistral" road bike rear derailleur from the 80's... it was probably pushing a chain across a 5-speed freewheel, or possibly one of those new-fangled six-cog set-ups.

an Ofmega composite rear derailleur. It's cutting edge design allowed it to read your mind and shift before you even thought you wanted to. I am not sure what the durability was like because I ended up with a shimano 600 drivetrain instead

This was part of a whole group from Italian maker Ofmega using I believe they called it 'nylon resin' to make the parts lighter. The parts were just too cool for school and broke during a hard shift. They also came in various colors, my favorite being the pink.

Looks like an 1980's Ofmega Mistral - Black, 3/32" friction dérailleur. Made of only the finest of hi-tech polymers.

#60 is an Ofmega Mistral 6spd rear deraileur. They were found on some Trek models. I remember them from my days at the old Denver Spoke. A friend of mine was the product mgr. I often thought they looked liked they were carved from bars of soap. They did produce these in a variety of colors, including a pink one. While the derailleurs were odd, I do recall thinking the Mistral cranks were pretty hot.

Yes! Yet another piece of equipment I shamelessly bought into because of marketing, Italo-cool factor, and downright ignorance of the laws of material dynamics!

This is an Ofmega Mistral derailleur circa 1982-‘83. These were intro’d in 1982 as a high tech, low weight step forward in components manufacturing in response to Titanium doo-daddery additions to Campy’s Super Record lineup, which made SR the lightweight King at the time.

Better! Lighter! Faster Shifting! Fantastical Engineering!... BULLSH*T! My FIRST Mistral was a black one just like the one pictured, and it lasted all of two months before the parallelogram pivots bowed out from their anchor points and magically ejected into a spray of springs, plates, and bloodcurdling rage while climbing Airport Hill in Worcester, MA. Thank God I could coast and push home from the halfway point.

My SECOND Mistral was a little pink masterpiece marketed as the Maglia Rosa model. It was so cool when new (it matched my metallic pink Pinarello), but one thing about brightly-dyed thermoplastic is that it UV’s and ozones quickly from the color it started out to a faded imitation of itself. In this case, it became meat-colored as the season wore on. It was like the Predator slaughtered a victim, harvested its appendix, and strung it from a chain on my dropout as a grisly trophy of the hunt. YOU get bonus points for knowing the movie reference. Anyhow, this fugly oil-fouled beast lasted a further two months before I came to my senses and hooked up a Nuovo Record.

Ofmega made some great stuff, don’t get me wrong. I still have a Mistral crankset in my “Attic” that is lighter and stronger than most of its contemporaries. But I personally think we should invade Italy and impose rough Chuck Norris justice on everyone associated with this brand for pushing these underthought, overmarketed, disposable artifacts of pure Italian engineering hubris on us. Roundhouse kicks for everyone!

I believe that's an early/mid eighties Ofmega rear derailleur, and it had plastic parts.

ofmega mundial to be exact...

It is a Suntour RD that mounted on the chain stay, in front of the dropout. I believe it was XC Ltd, or XC7000...I don't think it was a top level part (ie XCPro).

No problem...that is an Ofmega Mistral rear derailleur, probably circa 1982 or 1983. The folks at Ofmega were trying to "innovate" by using a "hi-tech polymer" (translation: plastic.) This allowed Ofmega to make the Mistral in array of colors, including yellow, light blue and an especially practical pink. I never used one personally, but imagine they worked about as well as a 1963 Campy Gran Sport.