Okay, I think I can help you crack the code (sounds a bit 'Da Vinci'!) which many bottling lines use.
For bottlers such as Glenmorangie, and other Broxburn area bottlers, at the bottom of the bottle the glass is feintly etched with a code, quite tricky to make out but legible in good daylight.
I'll use an example to explain - my currently open Ardbeg TEN OB, bought earlier this year reads L5 284 21:29 4ML. This means it was bottled in the year 2005, on the 285th day of that year at 9.29pm that day. The final few digits I think are basically translated as 'Ardbeg'.
So, L1=2001, L2=2002 and so on, followed by the next number being the day and then you have the time. This helps the bottler with quality control etc.
Diageo use something similar, and easier to read in black etching above the back label - eg my open Caol Ila 12yo OB reads L5310CM000, ie year 2005 310th day and I think the CM000 must stand for Classic Malt.
Anyway, my Uigeadails (all unopened, 1 finished which was one of the best bottles of whisky ever) are as follows:
L4 068 12:26 4ML - this one says 'BOTTLED IN THE YEAR 2004' on the back label and refers to 'a special vatting of 1993... and many older sherry casks'. Flip-top box.
L4 315 11:11 4ML - no mention of bottled in year XXXX and no longer reference to specific casks other then 'a special vatting of different syles of Ardbeg' but does mention 'tones of old ex-Sherry casks'. Perhaps implying less older stock in the mix? Again a flip-top box.
L5 347 07:23 4ML - as above wording, no mention of year, but no flip-box, the box is as per TEN OB.
Also, this stuff is £5 off at Oddbins just now
(ie down to £34, top value for such nectar
)- a sure sign that stocks are low and they want to shift stock before LVMH pump up the prices for future releases. The young oogy I would imagine being the replacement shortly.
Earlier this summer Oddbins reduced the price, from memory from close to £30 down to nearer £20, of the Ardbeg Very Young. Very 'odd', I'd say
Everyone will be off down to Oddbins today then......