Correct @Mannyrock these are from the 2000's to 2010
The examples came from a specialty technical company that was formed when Heilscher visited a steam factory in the late 60's and fell in love with them to the extent he used his engineering background to start making models as technical examples of old time technology ...
Not a lot on the web in English but a short synopsis here
https://www.mysidewheeler.com/hielscher.htm
Interestingly the family has kept the youtube channel after Hielschers demise with lots of examples of this clever mans work preserved for future generations ... He loved making small things .. anyone with a heap of money could buy big steam engines
https://www.youtube.com/c/Lutz...irlingmotoren/videos
He also made beautiful scale reproductions of steam trains and traction engines, but the business was just as much about clever tiny toys
In "normal" train circles he is probably most known for his Wuppertal monorails
https://www.monorails.org/tMspages/CPWuppModelRR.html
An Idea of his BIGGER models