Seeing it says philatelic counter, not post, I'm not sure I could say it was used for mailing anything, could I?
it would be helpful for you, to have you become conversant with the style
of SLOGAN POSTMARKS
available worldwide, to see that vast
amount of propaganda, placed alongside the CDS (circular Date stamp)
It should increase your enjoyment of Pmk collecting.
I found reference to your slogan (unlisted in database) but no images
also in those references were a common text word "bug", I am not familiar with that philatelic parlance.
Great Britain has a vast array of Slogans,
one slogan was removed (banned) as it had Queen Elizabeth "cocking a snook " with a thumb on her nose. (a classic display of derision)
Used on cover £10-£20