Les; I have found the biggest killer of these master cylinders (and the wheel cylinders), is lack of use.
If they sit for lengths of time they tend to start leaking.
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1953 M37 CDN
1953 M38A1 CDN W/WN
1967 M38A1 CDN2 W/WN
1968 M38A1 CDN2 W/WN
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