Where's my 'Ray's serial number

[highwayman]

My first bass - a stunning 2eq MM Stingray, black with a very attractive maple neck; I bought it from a fellow BCer who bought it nearly new from another BCer who did buy it new in 2015 so I suspect it's no more than two years old at the most.
My question is, where's the serial number? It's not on the back of the headstock and nor is it on the neck plate either. I'm sure someone will have the answer...

[bagsieblue]

On the bridge - between the string saddles?

[highwayman]

Yes it is! You'd have thought that due to me admiring it so long I'd have seen it, thanks.

B0579**