The number is stamped on one edge of the paper that is wrapped around the paper spool.
The number is stamped on one edge of the paper that is wrapped around the blue spool.
Blue spooled roll: 1 3/4 in x 4 in x 1 3/4 in; Paper spooled roll: 1 1/2 in x 4 in x 1 1/2 in
The record contains two rolls of silver printer paper for the ZX printer. The larger of the two rolls has a blue plastic spool. The smaller has a cardboard paper spool. The end of the paper on each of the roll is held down with a piece of tape.