Aitor, and I think Adler too have made SAK-type knives with forks, and spoons too I think.
After a very quick rub down and wash I found the blade is marked 'Japan', and nothing else. The scales are probably plastic, so I think it is a cheap copy of the Moki Sakurai style hobo knife.PS: the blade is still sharp --- I just cut myself!
It wasn't a deep cut, and I'm still alive. I haven't been back to this to do any more cleaning, but it's been sprayed with WD-40 and had oil liberally applied, so when I get some more time I'll really go to work on it.