I do not see a tunkou/habaki on the wide bladed takouba. It is not unusual for takouba blades to be mounted with a sandwich construction to the hilt, especially older and re-used blades where the tang may have been compromised precluding being pinned. Per Iain's research, the wide bladed takoubas were status symbols, usually carried by Emir's bodyguards and all I personally see is extra decoration at the base of the blade, aimed at enhancing the prestige of the owner.
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