I'm seeking Canadian Porcelain U-2421s in green. Unmarked or marked, but I'm especially interested in finding a marked example. There are many shades of green found in this style and I'd love to find a few of them.

I'm also seeking any information on where these were used. This is a Canadian style, but all examples I know of are so far from their provenance that no one has any idea of how/where they were used.

I'm willing to pay cash or trade good quality insulators for good condition examples. Thanks!