AFIK, the CZ has both a one-piece bolt and the undercut groove for the extractor collar that causes it to dig in deeper the harder you pull. Post-64s lack both, and some have crappy steel extractors. The bolt handle can be welded and the extractor replaced if needed.
A pre-64 would be awesome, but likely costly in .375, as would the Browning High Powers you didn't mention, but that are also available sometimes.
