Which pickup left these holes?

[Patcho]

I've just acquired a lovely Rob Armstrong (uk luthier) guitar, which has obviously had a pickup installed at some stage, and then taken out.
It has left two small holes on the side of the upper bout (i'm presume for volume/tone controls).

Could anyone tell me which make of pickup this might have been, and if I can still get it? I'd like to get one re-installed without making further modifications, and using the existing holes.

Thanks

D