I have a Colecovision prototype of Mr. Dos Castle. The case has been opened and has two socketed chips inside. The case itself reads "Coleco MR. Do 12K.RLS.1 6/15/84". The chips inside read "Coleco Mr. Do A 4k.RLS.1 6/15/84" on one and "Coleco Mr. Do B 8K RLS.1 6/15/84 on the other. These labels are typed with what appears to be a dot matrix paper label. Any ideas on ballpark value? I know that Coleco prototypes are more uncommon.

pics can be available upon request.

I am taking serious offers and please no lowball offers. A colecovision proto is much harder to find than an atari proto. I will sell if the offer is right. PM me with an offer if interested