Great Britain Philatelic Society

Hello All,
Checking through an album, I came across photographs that appear to be photographic busts of QEII by Arnold Machin. I got them many years ago and cannot remember who from.
I have no information about them and they are not stamped on the reverse with any source details.
There are a couple of similar images on the British Postal Museum website though not all five.
The attachments show reduced images and the actual size is 18mm x 12.5.
Any information would be appreciated.
Regards
Ron

They look rather like the ones in Tony Walker's display here:

https://www.gbps.org.uk/displays/pre-decimal-machins/frame1.php

(pages 9-13)

That certainly looks like the five.
Many thanks for that and an interesting display also.
Ron