Hellschreiber remains on my favorite mode list.
Simple, ticker-tape style, retro, steampunk… all are said to apply to the Hellschreiber mode.
The Flex-5000A does Hellschreiber well – https://k9zw.wordpress.com/2008/12/02/flex-5000a-does-hellschreiber/ – though this time I was using fldigi for the digital program.
Several years ago I put together a longer piece on exactly what Hellschreiber is: https://k9zw.wordpress.com/2008/08/04/repost-hellschreiber-about-the-mode/
Thank you to KX5JT for sending me the screen shot of his end of our QSO.
Hope to catch you on Hellschreiber!