I have an old Hamer Special. I've always thought it was an '81 (I bought it in January '82), but it might be an '80. If yours is the same as mine, it'll have a thick, flat-topped mahogany body with a maple top. The maple is very thin, really not much more than a veneer, so it doesn't affect the tone in the way the maple top of a Les Paul does.
Model details here:
http://www.hamerfanclub.com/andrewlarge/specials.htm(in the picture showing two bridges, the one on the right could be mine, because I sold it to the guy who wrote the article. Fame at last... :roll: )
Because it's essentially an all-mahogany guitar, I think it would be best with fairly vintage-output pickups. The original pickups were basically unpotted DiMarzio PAFs (probably not intentionally unpotted, I'd guess DiMarzio just weren't potting them in those days). I'd think a set of BKP Mules would do the job very nicely if you wanted something similar to the originals.
Phil King has a Hamer Sunburst with an Abraxas set that I know he's very happy with. The Sunburst is basically the same as the Special but with a bound body, only I'm not sure if it might have a thicker maple top.