Mauritania unissued 100-ouguiya note confirmed

This note dated 28.11.1975 is a recently-discovered unissued 100-ouguiya specimen, printed by TDLR without imprint, but this specimen bears the TDLR oval overprints in opposing corners on front and back.

Anyone with additional information about this specimen is encouraged to share same.

FYI, an unissued 200-ouguiya specimen dated 1977-6-29, also printed by TDLR, has been confirmed, but I am seeking the owner of same so that I may obtain suitable images to share.

Courtesy of Jean-Michel Engels.