ORDNANCE SURVEY 1/4 INCH ON CLOTH MOUNTED IN SECTIONS COMPLETE SET OF 12 THIRD EDITION MAPS 1919,1920 & 1921 ,THE 12 MAPS ARE IN A LEATHER CASE WITH LOCK AND KEY THAT DOES WORK .THIS IS A VERY SPECIAL SET OF MAPS AND CASE I HAVE NEVER SEEN A SET AS GOOD AND COMPLETE. AND I DON’T BELIEVE THERE ARE ANY OTHER SETS ON THE MARKET AS GOOD AS THIS AT THE MOMENT.