How to ID 009?

About 18 months ago I bought and fitted a 2nd hand 009 distributor - at least that's what it was sold to me as. However, I've been looking at pics of 009s in Aircooled.net etc and they don't look anything like mine. For a start, mine has a reddish cap and others all seem to have black caps. In the pics they also seem to look chunkier than mine.
I haven't got the car with me today to go and study the distributor, but can anybody advise a simple way to identify whether it is in fact a 009? I'm running it with a Weber and it is a mechanical advance - and it also has the 009 flat-spot. Can you get different coloured caps? Maybe someone just changed it. :o

I have a 009 with a redish cap on it. The last three digits of the part number should be 009 if its a 009
Raf

Great....... I'll check that as soon as I get home.

thanks Raf

the colour of the cap doesnt mean anything.....its the part number ending in 009 that is important, and it wont have the vac canister hanging off the side.