The first set of stamps issued by the M.V.i.R. was this set, composed of three Germania issues with a rectangular “M.V.i.R.” overprint. The stamps were issued on 1 June 1917.
A variant of this overprint can be found with the new value overprinted, but without the rectangular “M.V.i.R” overprint. These variants were never issued, and cannot be found validly used.