Most of the early Mec-Gar P226 Magazines I have from the "Pre-Ban" era, are blued steel and of the Sauer & Sohn pattern.
I would imagine these as I have shown above in Post #3 are post Ban (2004) manufacture, as they changed their design during the period of the Ban, where full capacity Magazines would have been "Restricted" and marked as such.
The other possible source of those shown in Post #3 above may have been for global sales, everywhere but the US due to the Capacity Ban, and restrictive markings, but were made available for importation post 09/14/2004 after the end of the "Ban".