Nope, it's old but it is a color monitor. Lots of them around many years ago. It should just take a composite video feed and display color if it's working correctly. Make sure that the toggle switch for the chroma mode is turned on. If it's still B&W, try working the Chroma pot for a while in case it's dirty and needs "exercising". Make sure that you are feeding it a composite signal and not the "Y" portion of a Y/C signal. If you are doing that, it will only show black and white. What source are you trying to feed it with?
Ah ha! I confess this turned out to be a bit of a head smacker.
Somehow in all my mucking around whenever I switched chroma to 'on' it must have been dialed down. And I didn't help that the source I was using was a little security cam I had lying around that, while color, has pretty low saturation to begin with.
Anyway, the picture is lovely in an aged, glowing, grainy mess kind of way. Thanks all so much for input and the push to keep tinkering...