The answer is easy:
There is no
MARS VLTOR type, because
Cohen 148 cites the BM as
his source. But he obviously simply misread BM 203, pl. 10.10, which was the BM's only specimen of this
type in Cohen's day, and which clearly shows
MARTI VLTORI. See
BMC 202 note on Cohen's alleged
MARS VLTOR type: "not in B.M., as he says; very doubtful."
As to the
Reka Devnia hoard, the report lists 116 specimens with
MARTI VLTORI (C. 154), all in
Sofia, plus 18 specimens with
MARS VLTOR (C. 148), all in Varna! Obviously the Varna coins too must in fact show
MARTI VLTORI, and they were just placed in error under
Cohen 148. So the correct RD count should have been:
MARTI VLTORI, 116+18 spec. = 134;
MARS VLTOR, no specimens in either museum.