What looks to be ALH with a script L in a shield/crown?

1st guess would be August Louis Hengelhaupt of Z-M and I would attach a high probability for this mechanics. There also was a Arthur Otto Hein, but that doesn't fit. MM is also common for the period and it could represent Max Möller, a Z-M tube maker during this time.

Experienced proof in Z-M in October 1936.

Kind Regards,

Raimey
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