It's an old buckling spring keyboard, perfect for some 90s DOS gaming or getting down to business typing an essay.
This one is a PS/2 model in the later blue label style, with the non-detachable cord and a manufacture date of 25-MAR-94.
It's 100% functional of course, as they always are. There are no missing keycaps, no scuffs, and the keycaps have not developed the "shine" that comes from heavy use. This keyboard was probably only lightly used. The springs still feel very crunchy and responsive.
representative photo: