FRONT DERAILLEUR:
Simplex SLJ - 28.0 to 28.6 mm clamp-on mount - Simplex "starburst" logo on facing of the hinged clamp - light aluminum alloy body, hinged clamp, and outer pivot arm (chrome plated steel inner pivot arm) - Clear anodized finish - pre 1978 outer pivot arm with Gold foil badge having a stylized "Simplex" logo in Black - chrome plated steel cage / pre 1978 "corner profiled" leading edge style cage plates / pre 1984 Simplex "starburst" logo on outer facing / series of three open windows on its outer cage plate - front pull design with hinged clamp pivot pin cable pass-through - post 1976 C.P.S.C. compliant "round head" clamp bolt - 20 tooth maximum capacity - model SLJ (Super Lucien Juy) A 500 ... [Simplex debuted their first SLJ series front derailleur during 1972 in the form of the SLJ AV 326 model which was subsequently modified ever so slightly (...as in it was fitted with a longer cable retention cap screw as well as a rear cage spacing bolt and corresponding nut having finer threads - details which are virtually imperceptible when the respective components are compared in a fully assembled state) for model year 1975 and then renamed consistent with their newly adopted conventions as the SLJ A 500. It was one form or another of this particular front derailleur that was to be de rigueur on all commercial Peugeot PY-10 models from inception through the first half or thereabouts of 1978 production despite it being officially superseded in the Simplex lineup as of mid year 1977 (...genuine Peugeot PY-10 team bikes were generally fitted with a Gold anodized version of the SLJ A 500 commencing May of 1974 in advance of its availability to the public at large, and these continued to be used throughout the 1975 season, followed by a Clear anodized version of same for 1976, then its re-engineered successor in the form of either a front pull SLJ A 502 or rear pull SLJ A 522 starting early in 1977 and throughout the remainder of that calendar year, and finally an SLJ A 522 from 1978 onward). Perhaps of note with regard to the particular SLJ A 500 front derailleur selected for use here would be the uncommon presence of a "round head" style of clamp bolt as opposed to the typical hex headed version. To the best of my knowledge, these arguably inelegant manifestations only appeared on very late examples of this derailleur (...although they were much more commonly seen on other Simplex offerings throughout 1977 and 1978) and were probably merely a retrofit pushed out the door in hopes of garnering C.P.S.C. compliant status - an exercise in futility if ever there was one inasmuch as the guidelines themselves proved to be so nebulous that these type of clamp bolts were dropped altogether by the end of 1978 after having been determined as unnecessary.]
