Quiz time - what's this (yes I know it's a pulley) but in detail?

[Gio]

and where's it from?

 

This was new to me - and the expert who discovered it. It's possible he may be the first person in the UK to see one.

 

So I thought it would be worth a Sunday evening quiz. Any ideas?

[Steams]

crank pulley from.................an engine? lol

[vodkashots]

bottom of the engine, on the crank, it connects the aux belts, Power steering, A/C and Alternator, its also the big chunky thing you do the timing on with a timing light,.