1960s Underwood 21
Here's a common Underwood-Olivetti 21 from the 1960s. The Underwood 21 was made in Barcelona, Spain after Underwood bought out Olivetti. This typewriter is pretty much the standard portable typewriter. It has all the standard features, it's easy to use, and additionally, it's great for heavy typing. It may not be the prettiest, but this machine is in great shape, and it is a workhorse!
The case is in good condition overall, but it does need some force to be shut. Just remember to move the carriage return lever back, make sure the machine is properly in the case, and then you can feel free to use the force you need in order for the case to latch.