I have a set of black-anodized, alloy chainring bolts stamped "Guerciotti".
They're in excellent condition.
I would love to trade the set for a set of 70s OMAS alloy bolts--or similar--in the same condition, or I'd consider a trade for the standard chromed steel Campagnolo bolts, 70s vintage.
If you have something to trade, e-mail me privately.
Thanks!
Charles Andrews
SoCal