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On the back of the mag, there is a seam where the folded sheet metal comes together. On an original Sig zipperback, the sheet metal is cut in such a shape that a zipper line is formed across the back at the seam, so to speak.
Here's a pic of a few different Sig mags. The one on the far left is a zipperback, while the two in the center are most likely newer sig mags, where the welded seam is ground smooth.
If you're simply interested in some 228 mags and are not concerned with original 'collectability'.... I have 2 Mecgar 15rd 228 mags, that I would be willing to sell. These are the best aftermarket mags available for Sigs, and are now Sig's supplier of factory mags. PM me if interested.