Well, who made it is hard to say. But it might be a scandinavian made one. The second letter on the axehead is "O" with a mark that makes it a "Ö". So it could be norwegian, danish or iceland made. Just a question, is that "600" on the head 600 gramm or what should that mean?
An axe with 600 gramm seems to be more a hatchet or a hawk but not the weight for an "adult" axe. They start to 1.000 gramm and much more, even. For lumberworks, i use a 1.600 gramm (which are about a little bit more 3 pounds) Ochsenkopf-Axe (germany). 600 gramm seem to really much too light for an axe.
If you like it and it satisfies what you need on a chopping tool or what ever, I wouldn´t replace it. But I would add a couple of compaignions to that one. Maybe an Ochsenkopf from Germany or whatever.
It has a nice axeform, afterall. I wouldn´t replace it, but tell me or us more about that one. I´m interested. What is written on that axehead?
Kind regards