Canadian Blocks

[bobsummers]

I have about 25 original blocks on my 1973 schooner, most of which could easily be replaced due to split shells. However I haven't been able to find blocks which are similar. The only markings are a maple leaf on the shell sheve plate with "Made In Canada" around the edge. The wood is either lignum vitae (same as the deadeyes) or as I believe, made from black walnut. They look incredible when sanded and oiled. All metal on the block is bronze. Can someone direct me to the manufacturer of these blocks or possible shell replacements with similar wood?
Thanks
Bob