Is this a correct ( service ? ) ADB caseback for a Speedy 145022, or an aftermarket ?

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Hi OF,
looking at this 145022 with what i think is a service caseback. Stamp/etching seems light and the ADB tree is at the bottom instead of on top. From a well known dealer on C24, who also sells put together Speedies ( which i made him to mention in the advert text ) so not much is for certain these days. Did my best to upgrade the picture.
Anyone seen this before ?

 
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caseback is correct for mid to late 80's and on.