Medieval Hungarian Denar? And Mystery Coin. [επιλυμένο]

I have this coin, which I believe is a 1585 Hungarian Denar https://en.numista.com/catalogue/pieces22144.html like this one. Although mine is a bit smaller than the catalogue listing, coming in at about 15.45mm. It weighs about 0.51g. Is anyone able to confirm that it's real or fake?

I also have this coin:

Sorry the photos are so dark, I haven't quite figured out how to light my coins for photoshoots yet.
I don't have much idea what it is, but it's about 3.74g and the diameter is about 22.01mm.

Any help you can offer would be awesome, thanks!

Second coin is Japan 5 Yen - I brightened and cropped your images using PhotoScape ...

https://en.numista.com/catalogue/pieces929.html
and has 四十五 ( 4 10 5 ) numbers so is Year 45 (1970).

Real 100%.The weight and diameter have variety from coin to coin.As you see the shape is irregular.

Thanks so much! That went way faster than I expected. I'm thrilled that coin is real, I've never had anything like it before. And my first Japanese coin, awesome!

PhotoScape, I'll remember that. Thanks!

PhotoScape (a free downloadable program) does many things ...
https://en.numista.com/forum/topic38900.html#p327826
such as brighten/darken, change colours, cut out circles (like I did with your pictures),
even make animations, and so on. I recommend it - very useful.

Downloaded! I'll play with it in the next few days.