Found this pack of goggles. Interesting they are in a box and not a sleeve. I believe one of the goggles in the box is a Mk 1. Notice that the strap is like a shoelace. It is also not elasticised as a the others are. The other goggles I have seen also have an elastic or partly elastic strap and also have a clip and ring closure.
Last edited by ypres on Sat Oct 03, 2015 2:56 pm; edited 1 time in total