This is a interesting X60A amp.  Dan says:

"My X60A originally came with that fuzzy gray "Ozite" covering, which leads me to believe that it was possibly manufactured in 1989 or 1990. I replaced the Ozite with a navy blue vinyl material I found and painted the chrome corners with "black wrinkle finish" paint. One oddity is a sticker on the back panel indicating a "Hot Rod Modification 1B" was implemented in the design - I have no idea what that refers to. My amp "guru" installed 5881 tubes in place of the 6L6GC's that came with it and it seems to sound smoother to me (especially when you kick in the overdrive). I love the sound of this amp and use it with a wide variety of guitars -- including the DC200 of course!"

See Dan's 1981 DC200 right here.

Like Dan's X60A above, this early 1990's model has been given a face-lift.  The Ozite was removed, and the amp was recovered in this cool white Tolex.  Very slick!