Red Star.

[MONDVOR]

Was there ever a reason given for moving the production from the Moscow Mint to Platinapribor Factory?

Of course it was a reason. After "long service award" decree came out it was a huge demand on Red Stars. So they decided to use another Moscow factory to make Red Stars and GPWs. Two factories can make more medals than one, isn't it?

According to Soviet-Screwbacks.com, it should be a v11 being in that range. However, with the concave back, it places it in the v13 range. Furthermore, the numbers seem to be similar to something out of the 3.3 million range.

I can search for a close numbers related to your Red Star. I can do it in the evening after coming back from my work. I think I've seen this handwriting many times.
About Soviet-Srewbacks classification you should ask Alex Filer. I do not use his classification, because it is connected with such subjective things as concavity. But concavity has nothing to do with actual die press-form, it is just a product of some technological differences during manufacturing (using a soft-metal pad, often lead, as a dempfer between the order and a press to equally distribute the pressure). Sorry, don't know how to explain it in English.