Some additional info on the Dutch 'Mauser' postwar mags as deduced from some left-over halfproducts:
First part was to create both halves of the magazine, from flat plates, where the latch hole was cut before bending.
Second part was to put both halves together and crimp them (creating the lengthwise crimp that also serves as a guide rail for the loading tool). The holes for the button were added, as well as the attaching holes for the button.
After that, the crimpline was dented crosswise, just below the top (to keep both halves in place, I guess) and the lips at the top would be formed correctly. After that step the slit for the follower was added.
Final production steps involved coating the magazine tubes. Final assembly was later done at Mauser.
It's not known whether this production method followed earlier methods. I believe they started from scratch, using the original blueprints (supplied by Mauser) as a guideline, followed by using the extruded Haenel (also supplied by Mauser) as a dimensional model.
The first examples, based upon the original 30s blueprints proved to be extremely unreliable and Mauser sent them an extruded Haenel mag to serve as a dimensional guideline. Some corrections were made to the design and this is the version that can be found labeled 'Mauser' and/or 'Made in Holland'.
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