It's possible that the ATA refers to the Army Temperance Association which was mainly active in the British army in India. Their typography had more of a flourish though.
#1 Top - Birmingham England made in either 1921 or 1946 I cant see it clear enough to tell definitively. Crafted by Herbert Bushell & Son.
#2 bottom - Birmingham England I can't make out the date letter clearly it could be as old as 1910 if it is a lower case L. You didn't include the maker mark on this one so I can't help you there.
You can google "the assay office / Date letter" to make a comparison yourself
Forgot to include that yes they are sterling 92.5% silver
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