It’s helpful when posters give the make as well as model number of the machine they’re referring to. I notice that some Bernina owners will even specify Bernina 830 Record to identify it. That’s nice.
According to wikipedia, Bernina seems to recycle their model nos. The 530 was introduced in 1954 and again in 2011, the 730 in 1963 and 2006, the 830 in 1971 and 2008. Way too confusing!
A list like QuiltE described would be great.