Only one crank has a cotter pin, while the rest acts like an American style bottom bracket in an English shell:
You can see the big nut that holds the bearings together like a one-piece BB. After removing it, you can see that the right crank and the spindle are one piece, and the shell has small press-fit cups inside:
Yes that is an unusual bottom bracket indeed. Out of about 3000 old bikes that I've fixed up, I have only seen two bikes with that kind. The bottom bracket shell is a different size from most 3-piece ones, so the bike is kind of stuck with that kind. also the cotter pin is a different size then most (I think) so you really have to stick with all original parts....
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