OBL L-90 / OBL-900 guitar pickup. 27-130

Model: 
L-90 / OBL-900
Maker: 
OBL

Can anyone help me identify these?

OBL 900?

update

I asked Bill & Becky on facebook and got this response "These are the pickups that Bill Lawrence introduced in the 70's that started the Twin Blade Revolution -- his L-90 design! Love, Becky"  Cheers,

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