piece, pc. = sztuka, egzemplarz

blank piece of paper?

Source: http://blog.entrepreneurthearts.com/category/entrepreneur-the-arts/entrepreneurial-tool-box/creative-support-entreprenurial-development-entrepreneur-the-arts/

sztuka, egzemplarz

piece , pc. (abbreviation) = sztuka, egzemplarz

English sentence and Polish translation

You are very lucky. This is our last piece. = Ma pan dużo szczęścia. To nasz ostatni egzemplarz.