Austrian Airlines Pen Set?

Hi folks. I have not been here in a while. My other passion, photography, has pulled me away for a long time.
But I was recently browsing a thrift store and came upon this.
https://i.imgur.com/4LjZxaF.jpg
https://i.imgur.com/NQxQSXT.jpg

Two Ballpoints and Fountain Pen. The ballpoints were heavily used, and the cartridge in one was dry. I believe it was original to the pen.

https://i.imgur.com/qvULQxu.jpg

They are all made of what I believe is brushed or satin aluminum, well made with good weight, and the twist pen operates very smoothly.. I don't believe the fountain pen was ever used. It came with a short International cartridge in the barrel, uninstalled. I loaded a converter and a favorite ink, and it began writing immediately, with smooth, even ink flow. It is a fine point, which is not my preference, but writes well enough for me.
Nib reads "Iridium Tip", and "Germany".

https://i.imgur.com/xsy6pPs.jpg

The whole set cost me all of two dollars, though I think it might have had a mechanical pencil that was not included, but that is just a guess.
Has anyone seen these, or does anyone know anything about Hauser pens?
There is a short video on my Youtube
https://youtu.be/iiLPaDOpDLY

Cool! It is possible that Monteverde or Schneider ballpoint refills would fit. It's worth looking into...Amazon has them, I think, and you can check online which refills might fit.

Thanks.It takes a Standard International converter. I got 3 or of 'em. :D