Real or Fake? Royal Dux, Katri Cupid/Angel

Hi all,
I'm new to the site and fairly new to vintage ceramics (but am really enjoying learning). I came across a Royal Dux cupid (or angel) figurine at an estate sale the other weekend, and after some research, am now stumped as to whether it's real or not?

It has no pink triangle.
The inside is marked "Royal Dux Czechosluvakia" (yes a "u").
Below that in blue ink is stamped "katri."
On the back is a number stamp that appears to read "5675" but there may be a number before those...a 1? I can't make it out.

It is utterly adorable, but in the interests of being more educated, I'd love your input! Thank you

 

If you check, Royal Dux katri, on eBay (USA) you will find a listing in: currently for sale & sold with the same marking. Both sellers are calling them 'vintage' so not much help there.

https://www.ebay.com/itm/VERY-RARE-...377279?hash=item48d4a744ff:g:~4AAAOSwo25dphTv

click on 'sold' picture or the wee 'see original listing': https://www.ebay.com/itm/Vintage-Ro...006836?hash=item36523da9b4:g:gN8AAOSw-hVdQPWa

I believe that the spelling with a "u" instead of an "o" is just a slight under-struck marking.

 

Here is another sold listing for a Royal Dux angel: https://www.ebay.com/itm/VINTAGE-GO...=true&nordt=true&rt=nc&_trksid=p2047675.l2557