Padre..Perhaps GT will see this and comment..I only concern myself with original items so I am not too familiar with others.
The transition began with Mauser is my understanding..they did not make the magazines but were instrumental in the design changes I suspect. All I know is the short diameter circular spring changed in the mid 30's to the oblong front to back type. Less chance of an accidental foulup inside the mag body. The spring is also angled up and towards the front of the magazine. Your photo's detail are a tad poor so it's difficult to analize.
Doug.. ALL coil spring magazines..I guess deffinition is a tad out of my nomenclature knowledge base?
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