Hm. I broke the sister hook of the traveler block, and got a new one, and it's grey. I have one grey and one blue. I've sailed several major events and never heard anything about it.Perhaps, ILCA measurers do not accept the grey coloured blocks at major events (never heard about such issues) and may say the grey ones are "replika", but this I do not know exact.
So, where is the text in the class rules, that exact do permit them, thanks (would help me)? To note: I am a bit "theoretical"/ "counting peas" here now, yes I know. But sailing some major events with the grey blocks and not haveing been asked by a measurer to change to the "Original builder supplied" ones (color blue black or violet) is not sufficient enough for me to claim: the grey ones are "persé" "class legal"..... they are class legal....