Tall mid century jug, acid green glaze

I have this for a few years, and always wondered who it was by.
Stands 31 cm tall, surface with pattern of raised lines; outside with acid green glaze, inside the neck teal-blue glaze.
Base inscribed "3607/30" and a mark which may read "T" or "L".

I always assumed it was German, but maybe it is Hungarian?

Thanks for any help,
Michael

I would say German, the numbering at the base would suggest that. Is your vase 30cm tall by any chance?

Great photos Rocco. Can I ask what lighting you use?

I would say german as well , uebelacker used 4 numbers quite a lot for forms , yes the last number 30 is size in cm, Volker will probably know the maker .

Thanks!
So most likely German, maker yet to be identified ;-)

@climber64: no special photo setup -- just a sheet of paper, and daylight (covered sky) coming from my terrace door...

Michael