Reference for Bekhorot 72:58

ג' מתירין את הבכור במקום שאין מומחה

- From the Mishnah I might have thought that blemishes which are not prominent are also permitted abroad, and the reason why the Mishnah speaks of 'prominent' [blemishes] is for the purpose of showing to what a length R'Jose is prepared to go [insisting that even so an expert is required].

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