Schliessencode CX11 habe ich auch schon mal an einem Stahlband gesehen: HIER
Es heisst dort:

Furthermore, the clasp has the clasp code "CX11"... in the German forum I also frequent, it was concluded lately that "CX" is NOT a random code but stands for "2011"... I have now seen more than 3 "CX" codes plus have read reports of more in existence. So it's definately not random.