It was this one: https://www.bruichladdich.com/laddie-shop/octomore/octomore-07-1-208-ppm/
Unfortunately they didn't have this one, which is rated to 309ppm: https://www.bruichladdich.com/octomore-super-heavily-peated-whisky-range/
I've had these at Bottega. I also own 2 bottles of the 6.2.
The .1 of the series is quite raw and captures the essence of the Octomore. The. 2 of the series is travel retail Exclusive series. Then they start experimenting with the rest of the series. I really enjoyed the 7.4 which I tasted at one of the Wade Bales events.