So, tell me about it(White/Orange) tube head??

some information need!!!
www.vilo.net/white.htm

It´s retubed and recapped

Well, it's not an Orange as its not even made in the same town and, from the picture of the internals, it looks like a fairly cheap run-of-the-mill late 70s/ early 80s amp. The components look rather basic with the PCB mounted on screwed rods rather than stand-offs although it is very clean inside.

I'm afraid 500 euros is way over the top for this amp as it's simply just one of a number of amps that came and went at that time. There's a Simms-Watt with matching 4x12 on ebay at the moment for less than that, and that is an amp that is much better known (used by Mick Ronson on Ziggy Stardust) than the one you have.