My Underwood Champion from the 1940s.
It’s rusty and well-used, but works like a dream thanks to Marr Office Machines in Pawtucket Rhode Island. Picked this up for about $20, got it spiffed up, and I write rough on it and love the aggressive pounding it takes.
I alternate between a few typewriters, depending on a variety of things (do I have to change a ribbon right now? Why pause? I just grab another typewriter.) All the typewriters I own (about 7?) are working typewriters and I use them all over any given 12 month period.
Excuse the mess on my work table.