PhilaKorea 2014 World Stamp Expo MA13 Machin cover
Undated Machin Post and Go Faststamps produced in Korea at the Exhibition from machine A3 003 or A004. Machin stamps with year code MA13 were produced by machine A004.
World Stamp Expo
The datastring on these is
B8KR14 A004-nnnn-xxx (where nnnn is the session number and xxx the stamp number.
Similar stamps with the same caption were printed in the UK sold by Royal Mail from Tallents House, but we know of no MA13 stamps produced in the UK.
This is a 1st class Korea-produced MA13 Machin on cover with Royal Mail cachet 7-12 August Philakorea2104.
Note this is not a postmark. (The cover used here was produced by Republic of China (Taiwan) PO)