1923 size ‘G’ insured registered envelope to Mafeking overprinted DUTY 5½d with a ½d stamp added to pay the correct 6d rate (4d registration and 2d postage) and two blocks of four ½d’s paying an insurance rate of 4d, all cancelled KANYE 5 JA 23.A Mafeking 8 JAN 23 arrival datestamp in on the back. Fine, a rare insured envelope that was probably carrying cash as it was going to the Standard Bank.