[Boatanchors] Hallicrafter questions

[future212 at comcast.net]

 I have a question on two different models of Hallicrafters. 
I have an SX-100 that I'm in the middle of restoring. The label on the back apron is missing. How can I tell if it is a SX-100, SX-100 MarkI or MarkII.

Next question is about Hallicrafters SX-25's. I have three of them that I have not started on yet. Does any one know what the model differences are between the colors? One has been stripped by a previous owner and I don't the original color. It's S/N is HA-34433. I have a black one S/N H-146678 ( checked twice, it is H not HA). Last I have a Grey/brown one S/N HA33660. Was there any ryme or reason to their colors? What color should I paing the stripped one?

Any help would be greatly appreciated.

Best,
Wyne H.