1916 10 Pfennig No mint mark (super rare?)

It looks almost exactly like those^
We sent the coin with a coin grader for him to double check and make sure there is no mint mark, and if there wasn't he was going to make us an offer. However, I honestly can NOT find a reference on price for this coin? I have seen there was one that was on Ebay a while ago for $250, but according to the forum I saw it on that was "a bargain basement price" so I am VERY wary to even accept anything less than that for this coin. It is in not good condition, but apparently for this rare of a coin it's still worth quite a bit.

Any help would be appreciated. I have searched and searched :*(

if it is genuine and you get a professional to certify it to make sure it is not a counterfeit (very common for this coin apparently) Then you have yourself a very nice rare coin.

If you don't get it certified then I would assume no one will touch it, Downside with that is if it is confirmed as fake then you will be out of pocket.

Can you post a scan or pic of the actual coin?

same question is here as well ----> https://en.numista.com/forum/topic5365.html
Sadly that one had a very very faint mint mark.