Millimetres
millimetres.
kilometre
a centimeter
you would use grams
meters
A metric gram would be precise enough of a measurement for a stamp.
millimetres.
if you are after a metric measurement than millimetres^2
Finland
You use the postage of the country of origin, in this case, you would use Canadian postage.
First class postage was 29 cents that year. A post card would be 19 cents.
It is in various rates, stamps will cost either a few cents to a few dollars. about 42 cents a post stamp
The D stamp would have a face value of 22 cents. There was a make up rate stamp with a value of 2 cents.
76
A postage stamp in Germany during 1937 would have cost approximately £3.47
It would have been 32 cents on that date for first class postage. A post card would be 20 cents.
In 1969 it would have been 6 cents for first class postage. A post card would have been 5 cents.