These mags are good/used. Blued, some light rust. Marked "VIG M1".
I have read conflicting reports on whether these will interchange with MP40 mags. I think that the consensus is that they CAN be used but that some minor alteration to them would be necessary. Once again, Google is your friend. They look great in MP40 mag pouches though and cost a lot less than MP40 mags.
Please check your local laws to be sure that you can be trusted with such a dangerous item. The responsibility is yours.