[Biggles]

Yes, it's a 1007B per my first post, confirmed by the lift.

So it looks like 17°-59°-59°-17° adv
and 7°-47°-47°-7° at .050"
Lobe centres both 111° and separation 111°.

But Glenn's data sheet shows 20°-55°-60°-15° at unspecified lift for the 1007B.

I've emailed Isky for the whole scoop.
Thanks for the interest, Barners. I'll report what Isky says.