Hi Paul, thanks, and yes, they are both cal 11. The Siffert I have been told is 1970, not sure about the MH. Ref serial numbers, the Siffert is late 202s and the MH is late 143s. I thought they'd be closer together but I can't make head nor tail of the Heuer numbering system. Maybe someone can shes some light?

David H

: Hi David - lovely pair of "girls" you have there. I
: thought the Silverstone was the "girl" watch. I assume
: they are both early cal 11 and it would be interesting to note
: how close the serial numbers are. The matching hands make these
: two very close indeed. My MH is due back from Tag Switzerland
: any day now and I will follow up on my earlier post regarding
: that experience. They look so good on the bracelet.
: regards
: Paul
: www.heuerworld.com

: PS email me if you want some camera tips. Always happy to oblige