Swedish 20x145R headstamp


I need someone who can explain me this headstamp.
The markings on the primer are easy to me:
Bofors 1946 lot 11

But the numbers on the case are a miracle. What are years, what are lots, what does they mean?
27-45 = lot & year of ???
37 = year of ???
S549 = maker ???

Every help is welcome.


If no-one here can help, you might try posting your question on this forum where they focus more on large-calibre stuff. There was a recent thread on the 20mm Bofors with some Scandinavians participating: bocn.co.uk/vbforum/forum.php


Hi Tony, the BOCN is plan B on my list.