That's interesting. They must have came to America under some other brand first I'm guessing. According to their site, they didn't get established in the US until '72 and didn't become Echo until '78, if I'm reading it right. Here's that link.
https://www.echo-usa.com/About-ECHO/About-Us
I had looked at the newer 620's, before I got my 461's, but only hesitated, because I wanted more power to run longer bars. I very well may end up with one at some point. Alot of folks sure seem to like them!
I'm still surprised they've been around that long! Dang near 60 years! Lol! I need to pay better attention!