Colormates by morris 4 piece desk set?

My husband and I are getting ready to have a baby and are clearing some space in our new nursery. We were going to throw this desk set up on Craigslist for cheap ($40 or so) but then saw that colormate furniture actually seams to be sought after. This set had been in his family since the late 50s or early 60s but we can't seem to find anything like it online and have no idea where to sell it or what to charge? Any insight or help is greatly appreciated.
https://i.imgur.com/rZzWhSM.jpg
https://i.imgur.com/pQRxGP3.jpg
https://i.imgur.com/pTgvOgo.jpg