Sorry, I do not see such photo at all. Had a better look now and yes!
The photo shows the diamond indeed lower then normal, but the
knife worn is not a HJ-Fahrtenmesser. Not an official one anyway.
I have not ever seen advertisements for this one with diamond, but
without.
The typical head for the dagger as worn by the boy and who is
claiming this to be a Wingen?
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Would it be possible the dad from the lad was a true "handy boy",
who knew to manage to get a diamond in that position. He never
will have had the thought that 80 years later some "experts" were
discussing why the diamond was there?
I may remember the "experts" that a lot was done after the war, to
make TR things and able to sell and trade for food, cigarettes and
whatever. I have seen this happen in a cellar at Solingen in about
1955/1956, when I was 13-14 years old. The granddad of people
I knew was doing this. It is a pity I cannot remember the
manufacturing markings, but I have seen boxes, loaded with this stuff.
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The head from Wingen in spring 1933:
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The typical head as by Pack and others:
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The typical head as for a childs bayonet with the about
length for a Fahrtenmesser from a price-list from October 1933 from Max Müller.
The price was just Rm 1.10