Here's a set of Canadian Porcelain products in the "CP blue" colour. These all have similar mottling and the same P inside a C ink mark that was standard during that era. From left to right are examples of U-2239, U-2421, and U-2582, respectively.

All three examples are in great shape with just one tiny fleabite on the upper wire ridge in the rear of the U-2421 cable.

I'm now asking $45 USD plus shipping for the group of 3. I'm always happy to trade for early Canadian glass or Canadian-made porcelain insulators. I have a long-standing want list of Canadian-made porcelain posted, [id=505519866; please click here to see it]. I accept PayPal, or personal cheque from any member of ICON or any collector with whom I have dealt before. Please feel free to contact me with any questions or for more photos, and look through my other items or unsold sales stock to combine shipping on items.