Is my fork 1" or 1 1/8th"?

I'm looking for a new headset but am confused as to which size my fork is.

It's the threadless fork off the Condor Potenza 2009 frameset. The headtube of the frame measures 1 1/4th" while the fork steerer tube measures 1", such that for ahead stems like the Deda Logo I require a shim.

Am I looking for 1" or 1 1/8th"?

Thanks

sorry if i missed something....