W. Ludolph compass

[Bern]

Good day Gents,
I recently acquired a W. Ludolph, Hamburg-Bremerhaven lifeboat compass binnacle with attached kerosene lamp, not sure on the vintage. I do know that Ludolph supplied compasses to the Kriegsmarine and the Luftwaffe. The 1942 "Lehrbuch Der Navigation" that I have mentions Ludolph compasses. Unfortunately, the compass has lost some of it's dampening fluid, so I'd like to top it up with the proper type. Any and all recommendations would be greatly appreciated.
Regards
Bern

compass: 12.6cm max main body dia.
binnacle: 19cm h X 21cm base dia.

[glaser]

Picture? Is it KM or LW marked please?

[Bern]

There are no other makings on it beside W. Ludolph, Hamburg-Bremerhaven and the serial number, so I'm now assuming that it's post WW2 and unfortunately not Kriegsmarine issue.
Regards
Bern