Hi Tuskie,
thanks! I hope that three weeks of hard work will be enough to install all the new things that I am buying for the boat while at home.
Your measurement brings your chain right in the middle of DIN and ISO
On a perfect shaped chain it should be either 48 or 50mm, but I guess thats within manufacturing tolerances because that dimension is not standardized.
I am quite sure ours is an ISO chain, as I could not find any DIN gypsy for the Quick Hector windlass. I doubt that the PO has changed anything onboard so all everything is supposed to be factory standard
equipment.
For general reference I have attached the details of DIN and ISO. In most chain sizes all measurements are the same, but 10mm has a different P1 measurement (pitch).