It's the latest versionof the 2500, about mid '95 i think, with the sled based laser.
the cds that don't play : 1 has a deep scratch that runs from the hole to the outer edge. every other player i have from the cd7000 to a 5500 to cheap sony players to car players will read the disc. the 2500 spins it up then stops, like it can't read the table of contents.
the second disc had a "gooey" smudge on it which i removed about 98%. but the disc produces clicking sounds or the sound mutes out here and there.
these are original cds, bought in the late 80s early 90s.