Hi, have got some Mavic 430 brake calipers
http://www.retrobike.co.uk/forum/viewtopic.php?f=22&t=198696&p=1503314#p1503314
or some black Modolo Corsa calipers
http://www.retrobike.co.uk/forum/viewtopic.php?f=22&t=160042&p=1201155#p1201155
both pairs have the recessed nut fitting.