I agree but the picture has some of his features.Thank you all for your replies.
Snautzer I think you may be right with Joppien as there are plenty similarities.The signature at the bottom doesn't look like Joppien however. I will try and post this in the correct place.
I've looked the link posted by M mjfur , last page of that link, leads to a website with names of LW personnel, sorted alphabetically, I have downloaded and looked L - N section, No one named as Manfred Mumker.Thank you Crimea River
That's a big help.
I will do a bit more research a day let you know if I have any success.