Its no secret that I have an unhealthy love of quirky, late 80's/early 90's bike stuff. In my drive to corner the market in obsolete shifters, I've amassed a pretty scary amount of Campy Syncro equipment. Shifters, unlike frames, are small and easily hidden from the prying eyes of those who'd question my strange obsession. Good thing too.
I recently came across a Syncro article in the Summer 1988 Record News, a news letter put out by Campagnolo USA in the 80's. Some interesting information in there. It confirmed the existence of 2 yellow insert variants, and maybe gave a little more clarity on what inserts work with what. Maybe. Still no listing for the Croce d'Aune small cage with 6 speeds that makes any sense. Good job guys!
Here's a little pictorial of the Syncro inserts.
The yellow "6V" insert.
The yellow "C" insert.
The blue "7V" insert.
The white "B6" insert. Sorry about the plastic.
The black "B7" insert.
The red "A6" insert.
The green "A7" insert.
Thats all of the 6/7 speed inserts, except the grey "7V" one thats used for Croce d'Aune in 7 speed. That seems to be the only one thats ridiculously hard to find. If you have one, you really ought to send it to me - I promise to give it a good home.
The yellow inserts are pretty close to being the same, except for a very subtle difference in the 5th gear, and a more pronounced one in the sixth. I suspect the differences become more apparent in freewheels that aren't tight-ratio'd.