Thank you to everyone for your responses, they've been great and very helpful. Jan, the pictures shown in the threads you provided are exactly the bottles I attempted to describe. I looked under the "How to Date a Bottle" FAQ and found this from Arbeg311:
"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. "
I have a bottle of Uigeadail in which I clearly see etched on the bottom in a single line: L5 237 18:32 4ML. But on the Ardbeg TEN "Introducing" bottle there is a very
faint etching near the bottom that I almost missed. Describing it: Left side has a double size "L". Right side has two rows of numbers, the top is "0 040" and the bottom is "1532". There is nothing like 4ML present. If I use the system Ardbeg311 described, the first 0 may indicate year 2000, the 040 would be the 40th day of the year (February 9), and the 1532 would indicate a time of 2.32 pm. I have no idea if I'm actually interpreting this code correctly or not.
As for the Taliskers, each has a code on the back of the labels (I did not have to open and drink the bottles, a flashlight did the trick
). For the "Map" Talisker the code was on the back of the front label and read: LLJL02198352. For the other one, the "Rock" Talisker, the code was on the back of the rear label and it read: L15R00709407. I've not found any information about how to interpret these codes. Anyone know any more?
Thanks again, everyone, and I'll keep searching.