Chief of the Drummonds in 1822

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This week I had an opportunity to examine the Highland Society of London's original collection of tartan specimens. The one for the Drummonds was submitted and sealed C S Drummond Gwydyr. I'm trying to work out who he was, does anyone know?

The chief at the time was, I think, Peter Drummond-Burrell who I'd have expected to have submitted the tartan. The family history is confusing because of the claimants to the Jacobite Earldom of Perth and there were parallel lines at the time. Most confusing.