Interesting that you mentioned J. B. de Loynes. He was Chairman of The Gambia Currency Board after their Independence in 1965, and prior to the formation of The Central Bank of The Gambia in 1971. He changed his name to drop the 'de' later in life.
REVERSE E 1 OVER 1 BUT SLANTING TO THE RIGHT AND HIGH
I WAS LOOKING AT THE EXAMPLE IN YOUR HALF PENNY VARIETIES AND noticed the high 1 on the first 1 in the date faces the other way in the two examples I have. So the error must have been repeated twice . is this the one mentioned by DRACOTT yes I think it must be because it is on an obverse 6 with the double incursed lines for the viens.
no I think mine are all rotation errors on the T in VICTORIA except the 2md although only the lifted base is present not the top as you have and in the T;s in Britt