Fred,
You might want to see if you can determine when the large Mantle photo (it seems on the bottom of the box?) was taken, that could help to limit the date range. The large Mantle photo seems late '50's to me.
I have boxes for the MM, MM4, and MM8 model Mantle gloves. I would love to add a box for the MM9 model.
I sent you a PM.
Mike