Duplicates, as in exactly the same, just two models:
2 S&W 586s, 6", just because I like them.
3 Ruger Bisley Vaqueros, 4-1/2", in .45 Colt (a pair and a spare) for CAS
If the definition of "duplicate" includes the same gun in different barrel lengths, different calibers, or slightly different configurations, the list would be much, much longer.
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Pemigewasset Valley Fish & Game Club