The main perforations for Romania are
|C||11 1/2 : 13 1/2|
|D||13 1/2 : 11 1/2|
and from 1909
|K||13 1/2 x 14|
K was used as main perforation on certain issues, but why we mention it is that it was used on most
issues between 1909-30 as a 5th major perforation. This is not mentioned in Michel.
During this period perforation K is often much more common than perforation A
Perforations A, B, C and D are line perforations. K is a comb perforation.