Dating ordnance survey maps
c.1953 - c.1960: The letter style of edition code spread to the rest of the scales from 1953, and was slightly modified.
Revisons and reprints were given print codes in the following format: 3000/29. On the small-scale maps, this would mean the same as 5038 - 5000 copies printed in 1938; on large-scale maps (6-inch and larger) the print code had the same format as pre-1934, thus 50/38 would indicate 50 copies printed in 1938.
The S indicates the printing location - Southampton.