White radio call letters for the B1 bis tanks of the 37e BCC (1re DCR), France 1940. The battalion used M, N, O (1st Company), P, R, S (2nd Company) and T, U, X (3rd Company); Q was not used. A dot before or after the letter (.X, X.) told tanks of the same section apart, so each sheet carries X, .X and X. in two sizes (letter height about 10.5mm and 7.7mm, sized for the side panels).
The HQ Codes sheet has 3D (Béarn II) and 4A (Bretagne II), both documented, plus 3V and 4Z as optional rear-command codes (allocated, not confirmed on a tank). Each code is no larger than a single letter.
