Who is the manufacturer of this cartridge ?
“L” headstamps are often identified as products of Lignose A.-G., tut their “L”, even on headstamps, was often in a much different, distinctive “Trade Mark” form. I would not rule out Lindener on headstamps with this particular style of “L.” Wish I could be more positive in my answer. There were several factories that used the “L” headstamp at one time or another, I believe.
Fede - yes, that is the stylized version that seems to be associated with the use of the letter by Lignose. I wonder if they ever use an ordinary serif-letter “L” of a plain block-letter “L”?