Dug out one of my Hakim mags for comparison to the Ljungman mag and with the exception of the front spring latch and the markings they appear to be dimensionally identical. I'm going to try them out at the range but they seem to fit in between rifles just fine. With the two mags in hand for comparison purposes I went back to the shop with the mags for sale and took another look. It turned out they had four total, two Ljungman and two Hakim. One of the Ljungman is of the Crown/C B with a Crown on bottom and the other is the J in circle with B and a Crown and B on the bottom. Both of the Hakim mags are marked identically with the Egyptian scribble marking. Condition wise the Ljungman mags both are a bit dirty/greasy with some wear but appear fully functional. The Hakim magazines have some light surface rust which should be easy to remove with steel wool but appear fully functional.
After comparing the Ljungman and Hakim magazines I'm guessing that the reproductions being sold are probably the Hakim reproduction mags being sold by Numrich Gun Parts for $41. Just from the picture they look a bit questionable but they are probably better than nothing if you had a rifle without a mag.
It also turned out to be a very good deal, bought all four mags for $100
The shop also had some MG-13 mags and I'm kinda curious to experiment with one sometime. I have read that with modifications they work well as a high cap option for the Hakim. After seeing the similarities I'm curious how they might work in the Ljungman. Anybody try it?