The “HB” in HBJES indicates the country. It is similar to “N” indicating USA registered aircraft. HB is the code for Switzerland and Lichtenstein.
how can you tell it belongs to jetclub? Under “remarks”, it says it belongs to rolex: jetphotos.net/viewphoto.php?id=6029418&nseq=0
You were off by one letter. The picture above is HB-JER.
Try this link: jetphotos.net/viewphoto.php?id=5836128
It’s also a different type of aircraft, GLEX vs GLF5.
does Liechtenstein have a special relationship with Switzerland? According to wikipedia (en.wikipedia.org/wiki/Liechtenstein) it’s borderd by Switzerland and Austria, however the aircraft uses the Swiss prefix of “HB”.