Archaic/dialectal; used attributively or predicatively to mean 'excellent, first-rate'.
Translations
This is a brag piece of workmanship.
Это первоклассная работа.
отменныйустар., диал. значение «excellent, first-rate» Definitions
Excellent; first-rate (chiefly dialectal or archaic). This is a brag piece of workmanship.