Where to Find the Batch Number on my Glenfiddich 18 year old

[bowmore440]

Hi all,

I've recently learnt that the Glenfiddich 18 year old is made in different batches and that this batch number can be found on the bottle. So I took mine, which I have purchased quite a few years back, and I cannot seem to locate any mention of a batch number.

Can any one tell me where it is supposed to be or what its format is like?

Thanks in advance.