02-09-2015 09:23 PM
Personally I share your concerns.
It is the wrong shape for an Army/Artillery side cap, may be original material or even an original cap but I think the insignia has been added later and I am not convinced by the still bright waffenfabre.
I would take him up on his offer and send it back.
Just my opinion, hope it helps.
Looks to me like a KM cap which has been incorrectly restored.
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I was also thinking KM cap lacking air vents and shape