A copy is a set of elements that is a duplicate of another set in every physical characteristic or that varies only slightly in duration.  Give the copy number last in the line of physical description.  Do not assign copy 1 to the first copy.  Use the word "copy" with the number and enclose them in parentheses.

300 ## $a 1 videocassette of 1 (Betacam SP) (30 min.) : $b sd., col. ; $c 1/2 in. $3 master.

300 ## $a 1 videocassette of 1 (Betacam SP) (30 min.) : $b sd., col. ; $c 1/2 in. $3 master (copy 2)

Assign a copy number to an incomplete set of elements that otherwise is a duplicate of another set in every physical characteristic.

300 ## $a 3 film reels of 3 (30 min., 2,665 ft.) : $b si., b&w ; $c 35 mm. $3 dupe neg pic.

300 ## $a 1 film reel of 3 (r2) (10 min., ca. 875 ft.) : $b si., b&w ; $c 35 mm. $3 dupe neg pic (copy 2)

Any distinctions between copies should be made clear in a note.  See 7B19.

300 ## $a 4 film reels of 4 (41 min., 3,690 ft.) : $b si., b&w ; $c 35 mm. $3 viewing print.

300 ## $a 4 film reels of 4 (41 min., 3,688 ft.) : $b si., b&w ; $c 35 mm. $3 viewing print (copy 2)

500 ## $a Both copies were measured for footage. A difference of two feet between them was found. There were no discernible differences between the two and hence these are copies, not versions.

Optionally, give the number of copies in one line of physical description when all physical characteristics are identical.

300 ## $a 1 videocassette of 1 (Beta) (30 min.) : $b sd., col. ; $c 1/2 in. $3 viewing copy (2 copies)

See also:

5.  Physical Description Area