"In 1943 John Rigby & Co. made exactly one rifle. During the height of the war, Rigby was busy making "machine gun clips." His Majesty King George VI ordered a .275 Rigby for Princess Elizabeth. Rifle number 5747 was completed on July 31, 1943. The rifle weighed 6 lbs 14oz with a 23.5" barrel and a 13 1/4" length of pull with a silver oval bearing her crest."

As far as I know, no rifles were produced for civilians during the WWII. For the princess, the ban was temporarily lifted.

http://forums.nitroexpress.com/showflat....amp;Search=true