Rather Splendid 1930s/40s Unused Razor Blades in Paper Sleeves

There is something so satisfying about these little paper envelopes printed with alluring graphics and each containing a single sharp blade. 
The Double Six was made in England.
The other 2 were made in Germany.
The KAMA SPEZIAL has printed on the blade
"Is synonymous with PERFECTION"
The pictures show the back, front and blade of each type.
Exactly the sort of lovely little things that would fit into a Printers Tray of Treasures perfectly