It appears to be P-10b in the catalogue. Here is the description from the SCWPM, general issues 1368-1960, 12th edition:
1.7.1941 (1945). Violet on orange and blue underprint. Portrait King George VI at left. Portrait varieties. Printer: W&S.
Value according to catalogue is:
6$ in VG
15$ in VF
70$ in UNC