Finding this one made me totally happy, with perfect crudeness to the KOOL engraved on either side, and perfect flourishes below the lettering. Once the prized possession of an RFS Jr., 1970s or so would be my guess. It's a Zippo, which I have not filled with lighter fluid, but my hunch is that one could get it working again. Kool.
2 3/16" t x 1 1/2" w x 1/2" d. Much handled, nice patina.