Frimindeks 2010: The web catalogue for stamps from Denmark and Greenland

The serie: Numeral or in Danish: Bølgelinie.

Illustration	Type watermark	Price/pris (Euro) C = less than 0.10 Euro	Note
	vm3 perf.: 12.75	C	Blue. With watermark type 3 (crown) - vm3. The colour changes in different variations of blue from darker to lighter and with a more or less clear colour.
	vm4 perf.: 14*14.5	C	Blue. With watermark type 4 (crosses) - vm4. The colour changes in different variations of blue from darker to lighter and with a more or less clear colour. Stamps with vm4 was issued in 1913.
	vm3 perf.: 14*14.5 type 1	3,-	Blue. As the type above but from 1917 issued on paper with the old watermark vm3 and the new perforation 14*14.5. The blue colour varies from lighter to darker and with a more or less greenish blue.