Jim,
The Tuareg Veil Key or Weight has a similar design to the Enigmatic Mark. The key has a circle, a center piece and a bottom one with three legs. The Mark only has the circle & the three legged piece. The Key is a Tuareg symbol of Amazigh ethnicity.
The symbol may or may not be connected to the Mark. Likely a stretch. Especially, why would the Tuareg nobles engrave it on their takouba and how/why would it be found on Sudanese kaskara, culturally separate from the Tuareg.
See the site and Google images of Tuareg Veil Key for several variations.
https://www.amazigh.it/tuareg-iwelle...n-swoul-niger/