Green’s Dictionary of Slang

inca n.

[‘from Incabloc, a Swiss-made shock absorption system found in most goodquality mechanical watches’ Looser (2001)]

(N.Z. prison) a high-quality wristwatch.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 92/2: inca n. any wristwatch of good quality.