Genuine Campagnolo SuperRecord (144 BCD) 1/2" x 1/8" track cog for sale. I can find shopwear marks (very light) but no indication found that it was ever mounted with a chain. $50 including domestic US shipping.
Might consider off-beat trades instead, such as 32 hole AirLite large flange hub to match the 40 track flip-flop I got from Brother Tom Hayes. Excellent narrow 700c rims from 70s.
Will select winner from replies recieved within 24 hours after digest posting containing this message.
As Richard No Relation Sachs says, contact me if you're interesting.
thanks for your interest
harvey sachs
mcLean va