From what I can tell, the signature reads as ‘Bauman’, so…
Using Google to look up ‘oil painting Bauman Germany’, I found a possible lead in artist F. Baumann. Probably German or Austrian, and seems to share a name with a Swiss artist (Fritz Cäsar Bauman), so be careful not to mix them up if you decide to do more research on this. However, Fritz worked in Expressionist and Cubist styles, so that should help clear up any possible confusion.
Here’s a link to the relevant Baumann, so you can compare the painting style and affirm whether the painting you have is one of F. Baumann’s. Underneath that, I’ve also added two images of his paintings and one of his signature.
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I hope this helps!