Campag 27.0mm Crown Race?

asprilla Posts: 8,440
edited June 2013 in The workshop
I'm busy building up an early 90s Peugeot Chorus.

As the name suggests it came with a full Campag Chorus groupset. However, I've just tried to put the headset on and the crown race appears to be 27.0mm instead of 26.4mm. I don't think Campag did 27.0mm crown races.

Am I wrong?

I know I can file the crown race to get my 26.4mm to fit, but I'd prefer not to so can I get a 27.0mm crown race and use it with my Chorus headset?
I own a lot of wheels, but I try to rotate them.
Mud - Genesis Vapour CCX
Race - Fuji Norcom Straight
Sun - Cervelo R3
Winter / Commute - Dolan ADX