The number on the back of the ATS badges is not the recipient's Army number but simply the number of the badge which depended on the order in which it was issued - ie the higher the number the later the badge was issued.
I do not know if there was one series for all the ATS badges or whether they were numbered locally.
The attached form for the similar TA lapel badge shows both the recipient's badge number and his different Army number.
Jon
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