For your consideration is an excellent condition Campagnolo Euclid rear derailleur. It has an aluminum inner parallelogram plate vs steel for Centaur. Otherwise, the two are very similar. It is in excellent condition, bright Campy chrome, nice everything, please zoom in. Here is a Campy passion for detail. Check where the cable exits, there is a little groove for the cable when using low gears. It is a sharp edge on Centaur, check my other listing. 

     This will index with Campy 8-speed, road or mountain. For 88 & 89 mountain, Campy put the adjusters on the levers, so the derailleur geometry is 8-speed index. If used with Ergo's, downtube or inline adjusters will be needed. Additionally, I have a Themis rear w/ Icarus shifters on a bike. I took a micrometer and compared, the parallelograms are the same. 

     As to dating this, the first step is easy. The first year was 1988 and adjusters were introduced in 90, so 88 or 89. Next is a picture comparing a 1st year 9/88 Euclid catalog, showing long cage only and my 4/89 Centaur catalog w/ 3 cage lengths. I'm guessing the 2nd year Euclid would offer cage length options if Centaur did, but I couldn't find an 89 Euclid catalog to verify. So I'm going with 89 Euclid. The pulleys are the ball bearing ones. This may be an upgrade. I say 'may' because Disraeli Gears mentions seeing quite a few Euclids with these pulleys, enough to wonder if it was an option. Either way, the pulleys are in excellent condition, please zoom in. 

     In a way, this is a Record derailleur, a year before Record came out (in the drop/slant parallelogram style). It has ball bearing pulleys, an adjustment screw for the lower pivot, aluminum inner parallelogram plate, and hex cable nut. Differences include no adjuster, steel inner cage. All in all, pretty close. 

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