The reason you occasionally see these advertised on eBay as "Belgian" or "Royal" is that they were designed by a Belgian manufacturer (and active internet coffee forum participant) many years ago based on classic designs, build by hand, and called by him "Royal". His balance brewers were very well made, but cheap Chinese knockoffs like the one here outcompeted him and put him out of business.
I bought a contemporary variant he designed, Il Cafetino, as a wedding gift for a friend; it used springs instead of balancing for controlling the brewing operation:
Thanks to archive.org, his old website is preserved; it includes things like details of the production process.
Syphon machines are quite capable of brewing a very robust cup. Just use more coffee.