Good Morning ICON'ers. At 6 AM in Merritt this morning, it is 0 degrees Celsius, or 32 F degrees for you folks basking in warmer temperatures.

For your early morning challenge, I'm trying to find out the manufacturer and country of origin for these 3 insulators. No markings at all on the insulators or pins. All appear to be the smaller, British size pin hole, but that can be misleading. Measurements are accurate to the nearest 1/16 inch.

One other challenge is the symbol above with a R over W over I, contained within a vertical diamond . Which manufacturer [and country, please] employs this symbol.

Again, thanks for all your help and previous replies