Hi Otto,
Here is some information for you, hope this helps.
Your explorer is a 92 made Terada Explorer. The neck pick up is a Gibson one that was standard for many of the ObG's (it is not a '57 classic). The bridge pick up should have had the same patent no but I can't see it on the pictures so then you would have to presume that it is a replacement part and perhaps the make will remain unknown. What you could try to do is to measure the DC resistance and see if it is in line with the neck pick up. If it measures a lot more, then you can be certain that it is a replacement part because the orignals would have been quite matched, for example. 7,9 Ohms in the neck and 8,2 in the bridge or something similar, but not 9,5 or 11 if you know what I mean.
I can't give you any information about the wood or finish. Main question is, how does it sound and play for you? If you're happy with it, that is all that matters.
Hope this helps...
Regards,
Joop