The late 10s and early 20s era of Canadian Porcelain production seems to have resulted in some of these oddball Locke-like blue highlights on otherwise deep reddish glazes. Here's a nice pair of signal (U-2239) and cable (U-2582) made by Canadian Porcelain with this great bit of character. Both have variable amounts of blue glaze pooled in the wire grooves and some on the bases. The signal also has some on the crown just above the wire groove.

Both examples are VNM from what I can see.

I'm asking $25 USD plus shipping for this pair. 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, 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.