PhilaKorea 2014 World Stamp Expo Machin Faststamp set
Machin and Union Flag Post and Go Faststamps produced in Korea at the Exhibition from machine A3 003 or A004.
World Stamp Expo
The datastring on theses is
B8KR14 A003-nnnn-xxx (or A004) where nnnn is the session number and xxx the stamp number.
This is a single 1st class (undated) Machin and single 1st class Union Flag from either machine A003 or A004, on official Philakorea2014 cover from KoreaPost, cancelled with a Royal Mail cachet, 7-12 August Philakorea2014.
Note this is not a postmark.