Usually, collectors specialize their collections with postmarks carrying interesting dates. In most cases, these are dates related to historical events or maybe dates of issuing stamps (first day). However, I know some of them who collects dates that are attractive from a numerological point of view ...
Stationery of 75 cents, sent from Ljubljana (4.4.44) to München. From a numerological point of view, probably the most notable date of the period of occupation of the Ljubljana province.
