Strange VT50 Decscope

A couple of months ago I acquired a strange looking terminal that was said to be a VT50 Decscope. A picture of it can be found on my web site at: http://www.woffordwitch.com/VT50.asp The case looks like it was cast in pieces from a rough mold of a standard VT50. Many of the key caps are not the usual color, and look more like the key caps on the earlier VT05. I have not opened it up and studied the inside yet to see if it has the proper "guts" of a VT50. The previous owner said that he worked for DEC back in the 1970s, and they gave this "VT50" to him to use at home so that he could remotely connect to a system at work. Are there any former DEC employees (or anyone else) here who have ever seen or heard of anything like this? Thanks, Ashley Carder http://www.woffordwitch.com