Early Submariner with Arabic dial?

[Tralfaz]

Hello!

I'm a new member (just found this forum) and figured my first post ought to be a good one.

So....

A friend of mine just laid his hands on a 1950s era Submariner. The dial is marked 100m=330 ft, Submariner. The weird part is that the hour chapters are all Arabic numerals (1 thru 12) in a sort of German or Gothic type font. (I'll try to post a photo anon).

I've never heard of this and thought I'd toss it out there to those more knowledgeable than I am. Has anyone every heard of such a thing?

Thanks in advance!

Tralfaz