Took a photo of my Bakelittfabrikken cartridges earlier today as part of indexing my collection. Not a great photograph by any means but it’s good enough for this purpose.
The «dirt» on the 12,7 ones are rust from being in belt links.
[color=#FF0000]Here[/color] is the same image flipped, with designations, cartridge names, and a colour legend.
Thought that some of you may find it interesting.
The reason there are some duplicates is the large amount of variants found in the same designation rounds. Especially NM 134 and NM 226 have large differences in certain runs.
As you can see, newer cartridges use a different type of plastic, more matte than the old shiny one.