At left is a "backwards C" example in a nice rich light green colour. It has watery, clean glass and great surface orange peel texture and straw marks all over. I'd call it NM with some light wire scuffs in the wire groove and a handful of micro nibbles on the rear base edge.
At right is a light aqua three piece mold unit (  for the price guide users) in plain aqua. This is among the last generations of Canadian Pacific 143. This example has been kept with original soot and pinhole creosote because it just looks better that way. I'd call it NM with just a handful of tiny fleabites and some scuffs scattered on the crown, and a 1/4" factory open bubble on the front base.
I'm now asking $20 USD plus shipping for the pair. I'm always happy to trade for early Canadian glass or Canadian-made porcelain insulators. 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.