It would a 4 digit number stenciled on the left hand side (bonnet up, looking from the front) of the bulkhead - i'm guessing it will either start with a 3 or a 4. If the car's had work, or been subject to a respray at some point in its life the RP (Replacement Part) number could well be missing.

If it is there, you can check the build date here:


http://www.citroenet.org.uk/resources/organr.html

Back of the car, at the badge,
What this website is called
What part companies call them selves
And see what all that calls your car
Sorry I was being a half witt having a Tongue in cheek moment

And it's on a metal plate. You have have to do some cleaning to remove wax oil or dirt
Iirc there fitted sideways?

? That's the VIN plate.

The RP number looks like this:

How odd
Mines on a metal plate and when put into website gves an accurate build date
Maybe some did and didn't?

Oh, got any pics?

No, I'll take one
I say that and I'll forget but I'll try and remember
Im pretty certain I'm not talking bollocks, but being an anarexic rake I probably am imagining it

I won't let you forget.

Thanks for replies
big letters on original bulkhead wtds erjds
white stick on label bottom bulkhead 9GA24 and underneath 592260
vin plate automobiles citroen
pmac 0120101v
vf7azkaooka288***
and at top of bulkhead 3957
done a check made 9th sept 87
only its birthday today