ceskio - welcome to the Whisky.com Forum! I found some history on Bulloch Lade from Wikipedia -
Caol Ila is derived from Gaelic Caol Ěle for "Sound of Islay" (lit. "Islay Strait") in reference to the distillery's location overlooking the strait between Islay and Jura. It was founded in 1846 by Hector Henderson. The distillery did not fare well, and changed hands in 1854 when Norman Buchanan, owner of the Isle of Jura Distillery, took over. In 1863 the business was acquired by Bulloch Lade
& Co, of Glasgow, traders in whisky stocks. By the 1880s over 147,000 gallons of whisky were produced there each year. In 1920 Bulloch Lade
went into voluntary liquidation, and a consortium of businessmen formed the Caol Ila Distillery Company Ltd. In 1927 the Distillers Company Limited acquired a controlling interest in Caol Ila, and in 1930 Scottish Malt Distillers Ltd obtained ownership of all the shares. The company eventually became part of Diageo.
I have reached out to our contact in the Diageo Archive Department. It's a possibility they may be able to date your bottle and if so, then we will need you to post photos.