It appears to be for a .380 auto or perhaps a variation of 9mm. I have never seen a clip like this before and am curious what make and model it is for. Any ideas?

It is for an Astra Model 300 and looks like an aftermarket replacement, probably made by Triple K.

Thank you !

I think it may be an Astra Model 600 (9mm Luger cal) magazine.
Looks like a repro mag,,most all orig's are 'Astra' marked usually on the tab
and the follower is chrome plated or at least in the white.

IIRC the Model 300 magazines have an open top slot on the right side that runs down almost 3/4's of the length of the side. They do have the same 'tab' on the base.
The later Model 3000 (post war) had no tab on the base and no open slot on the right side.

Both the Mod 300 and the 600 mags should have a thin short slot cut into the left lower side of the magazine wall that also intersects the back spine of the magazine.
Thats where the magazine latch engages and holds the mag in place in the pistol.

Thank you for the additional information 2152hq. It is much appreciated.

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