I'm having trouble figuring out the alphanumeric stenciling on the tail of the Martin XBTM-1 below. This is the clearest picture of the Martin XBTM-1 I could find. I have two of the three alphanumeric stencilings deciphered. The 3rd set has me stumped.
XBTM-1 then
85161 (or 85162) on the rudder since those were the only two numbers for the XBTM-1s
then below the XBTM-1 stencils
????? is where I'm stumped.
Any help much would be much obliged.