I have one of these blocks. My uncle gave it to me years ago, but I didn't know anything about it, other than it was made to fit a jack. The problem is, l don't really know where it is now. It definitely did not get thrown away, but it must be hiding in the deep shadows somewhere. I will need to keep my eye open for it. I recall that it was in perfect condition (probably not used much).
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1953 M37 CDN
1953 M38A1 CDN
1967 M38A1 CDN2
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