Need help with German Officer boots

[tonyhayes198]

I recently purchased this pair of officer jackboots. They are about 50.8 centimeters tall from the heel to the top. I was wondering if the style was used during WW2 by German officers? I have attempted to look at period photos but haven't found any boots similar. I am concerned about the tops being curved the most, I don't think this is common. The last two photos are of a maker's label on the inside, I am unable to make it out. Any advice or information is greatly appreciated.

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How do you know they are officers boots?
How do you know they are German?
Looks like generic riding boots like they were made from 1900 until today.

Chris