I can tell you what it's not.... A Seymour duncan
Almost certainly a Pre-Production Dimarzio SDS-1 /DP 111. Exact same specs, just with a patent applied for sticker instead of the production DP 111 sticker.
http://www.thomann.de/gb/dimarzio_sds_1_dp_111_bk.htm
Yes! Thank you!
I swapped one out for a Super-D way back that looked like that in a Strat , probably late 70's or early 80's as well (both Dm) . If I remember correctly it sounded good .
Funk-f - I believe the Allens were pretty standard back then , on some. I still have a few of them in the cupboard ( in HB's
trying to remember if Japanese MMK's had them as well like on Arias or Westones, etc. (the Allen screws)
A friend of mine has an old Aria strat copy. It has single coils with brass hex screws and two bar magnets along side in the neck and middle positions (the bridge is a Fast 2).