1968 GE built-in dishwasher
This definitely must not have been used, you may be able to use this for a while, definitely test it out before you get a big load of dishes and decide it doesn’t work put some dishes in that are visibly soiled, some glasses in the upper rack that have peanut butter or something inside them to see if it actually is working.
Definitely take the lower panel off and leave it off and watch it for the first few loads to make sure nothing is leaking pump seal leaks, and trip shaft leaks for the drain valve or common on this machine. There’s also another dozen places that could leak.
There are people who are into vintage machines who may enjoy using an older less efficient machine, but if you’re used to a modern dishwasher, that’s much quieter and does a better cleaning job you may or may not be happy with this one.
Let us know what you find and if you have any other questions
John