I guess it is a bootleg pcb, but seems like it is fully working and after some adjustments the Hanty mtc 900 has a very nice bright screen.
Now let's start to investigate the weird parts of this cab, I hope Ully can help us to check some details at the Storage.

First of all:the coin door.
It looks like not original, but there is an untouched original Nintendo sticker inside with serial number.
There was a similar
Donkey Kong on ebay a few weeks ago, we can compare it.
Mine:

Ebay:

As you can see my serial is much lower, maybe it was the early version of the licensed DK?