That looks just like mine! I've had mine for awhile...I'm guessing late 90s is when I bought it new. In the back by the tubes theres a serial number sticker that says N-####, mine is N-4354. From what I've found on the net, it's a version 1 2:90. There's only a version 1 and 2 as far as I know. The only difference I know of is the power light is red instead of blue and it looks slightly different (I think the knobs and grille behind the slats are silver too). Also, the power tube arrangement is different. I'm not sure if there's anything else that's different. If your friend is going to give you a good price, I'd jump on it! It's been a great amp for me, especially since I picked up a Triaxis to go with it. Also, I've recently been bit with the NOS tube bug and it seems the preamp tubes (there are 3) in the 2:90 really do make a difference in sound! I had some JJ 12AX7's in there and just could not dial out a raspy buzz on my lead 1 red Triaxis mode, but as soon as I changed the 2:90 preamp tubes out for some nice NOS tubes it again sounds great! Hopefully I helped in making your decision!