Strange CZ magazine 10 round ?

[FimRire RongLifle]

Had a 452 once not sure if this magazine was an older version but I found one that especially when I accidentally picked it up added the extension that simply dosnt work with my 455. two other mags as in on the right work fine modified and 3 other stock mags all have the raised area with logo on the side and work fine. Is the one on left older or some generic one? Thanks for any info.

 

[Nodak]

I believe the one on the left is an earlier version. I have one of then also and the feed my 17hm2 perfectly just like my newer one.

 

[FimRire RongLifle]

Thanks. I believe the older one may have just not liked a magazine extender mod and I will test it that way