I found an interesting paper about the Sherritt Company.
https://gosling.ca/Sherritt/Sherrit...Research.pdfThe document containing numerous papers and other materials about Sherritt's history. A lot of work.
I haven't had the time to read everything, but there's an interesting paper on page 42 about Canadian coinage based on the sintering process of nickel (metal powder compression).
Sherritt developed two concepts for the
Royal Canadian Mint (
RCM): one based on power-rolled strip and the other on static compression of blanks. Initially, nickel planchets were produced by laminating ingots.
The nickel strip produced by the pilot plant was retained, but the actual setup produced too thin metal sheets. Therefore, they had to overlap and compress two strips together to achieve the desired characteristics as per
RCM requirements. Unfortunately, this method produced blanks that sometimes delaminated. This problem was resolved with the formal manufacturing plant.
All this work was carried out in the early 1960s. Sherritt produced some demos in 1961 and secured the contract from the
RCM in 1962.
So, I think this explains why we only find split versions of the Nickel for 1962. Early deliveries in 1961-62 were based on the pilot plant with the laminated two-sheet method. Subsequent deliveries were made from the formal plant without this issue."