If I recall correctly - it's been a few years since I've been to a Clan Scott Society AGM and seen the emblem itself - the President of the Society (and thereby an honorary chieftan of Clan Scott) wears a gorget/pendant with the chief's crest either encircled within the crescent of the gorget or pierced into the gorget. This device was introduced to the Society just a few years ago as a badge of office to be worn in lieu of/in addition to the 'chieftan's badge' - the two feathers behind the strap-and-buckle on one's headgear.

That's the only thing I've seen that comes close to what Harold described (aside fom the chains-of-office).