FS27a Machin 50th Anniversary Post and Go Collectors Set from PO SSK

2017 marks the 50th anniversary of the issue of new Queen Elizabeth II definitives featuring Arnold Machin's iconic bas-relief sculpture which replaced the Wilding definitives. Arnold Machin's 1967 portrait of Queen Elizabeth II (sometimes referred to as the Machin head) has been reproduced over 200 billion times.  

A new commemorative set of Post and Go Faststamps is issued in six colours, approximately matching the original ½d orange-brown, 1d olive, 3d violet, 4d deep sepia, 7d bright emerald, and 10d drab issued in 1967-8.

This is a set of Collectors Set of 6 values from a Post Office Self-Service Kiosk