Royal Regiment of Scotland on Exercise wearing Tam o' Shanters  1970s

From a larger collection of British Army/NATO photos I have listed.

I believe this is a PSA Photograph Authentication Type I:

• Type I – A 1st generation photograph, developed from the original negative, during the period (within approximately two years of when the picture was taken).
• Type II – A photograph, developed from the original negative, during the period (more than approximately two years after the picture was taken).
• Type III – A 2nd generation photograph, developed from a duplicate negative or wire transmission, during the period (within approximately two years of when the picture was taken).
• Type IV – A 2nd generation photograph (or 3rd or later generation), developed from a duplicate negative or wire transmission, during a later period (more than approximately two years after the picture was taken).