The number of sheets in a ream has varied locally over the centuries, often according to the size and type of paper being sold. Reams of 500 sheets (20 quires of 25 sheets) were known in England in c1594;  in 1706 a ream was defined as 20 quires, either 24 or 25 sheets to the quire.  In 18th- and 19th-century Europe, the size of the ream varied widely. In Lombardy a ream of music paper was 450 or 480 sheets; in Britain, Holland and Germany a ream of 480 sheets was common; in the Veneto it was more frequently 500. Some paper manufacturers counted 546 sheets (21 quires of 26 sheets).  . Bach 's manuscript paper at Weimar was ordered by the ream of 480 sheets.  In 1840, a ream in Lisbon was 17 quires and 3 sheets = 428 sheets, and a double ream was 18 quires and 2 sheets = 434 sheets; and in Bremen , blotting or packing paper was sold in reams of 300 (20 quires of 15 sheets).  A mid-19th century Milanese -Italian dictionary has an example for a risma (ream) as being either 450 or 480 sheets.