1919 saw the release of only 3 stamps – all of which were Special Delivery stamps. This particular design was used across 15 special delivery stamps between 1906 and 1945 with a range of different color variations, watermarks and/or perforations. Color variations can be subtle across the years so counting perfs. and testing for watermarks becomes an important method to identify stamps from this year. The Special Delivery stamps of 1919 are all perf. 11 and come in ultramarine, dull-violet or pale blue.