How many copies of the Gutenberg Bible were first printed in 1455?

Approximately 180 copies of the Gutenberg Bible were printed and first made available in about 1455. Of these, 145 were done on paper. The remaining thirty-five were printed on vellum (treated calfskin). Forty-nine Bibles survived into the twentieth century and only twenty-one of these are complete. Of the thirty-five vellum copies, only three exist as complete copies.