I heard there were Cal 12 within some Monaco 1133B and until this afternoon, the truth is that I have the original Cal 11 within my 1133B, and I was really happy. The previous owner changed the square gasket as well, so sweet. Before I leave the shop, the boss gave me his last Heuer 16mm buckle as a gift, super sweet. I will now tailor-made a blue Corfam strap to match...

Cheers and happy days to all... Ian