Your opinions on authenticity? I have serious doubts only because there were only 600 minted. Ghetto coin 1943.
When comparing it with other images, it seems authentic. Try weighing it, it should weigh 6.98g. Also, try measuring the diameter, it should be 33.45 mm. Scarce coins like these are often counterfeiting targets, so I can see your suspicion.
I've see a few of these in hand. I don't like yours. Voids in obverse surface at 12:30. Surface appears rough and irregular - should be flat. Think I see some pimples too.
The diameter is 33.30 mm and the thickness is 1.93 mm. I don't have a way to weigh it. It is non-magnetic.
No, it's a fake. Available at Aliexpress for a few dollars. There were much more than 600 pieces minted. Many, many more. The information about the amount of coins is crap.