The Simplex Super LJ 503 front dérailleur is one of the best and most elegant front dérailleurs of all time. They are especially good with TA Pro 5 Vis and Stronglight 49D cranks because of the flat outer cage plate. The seat tube clamp fits 28.6mm seat tube and is a lovely casting with the sunburst Simplex "S" logo. Lightly used with a few scratches on inner plate. I bought this and then decided to go in a different direction on my project. Used a Huret set rather than a Simplex) $70 obo shipped CONUS. Pics available or see the listing from where I purchased it:
--
Sadiq Gill
Richmond, Virginia
US&A
Latitude: 37.58
Longitude: -77.51472