136246 1942 10S DEEP ULTRAMARINE (SG478b) GOOD USED BLOCK OF SIX.

1942 10S DEEP ULTRAMARINE (SG478b) GOOD USED BLOCK OF SIX. Good used block of six 1942 10s deep ultramarine (SG478b), slight perforation separation and creasing, 'LONDON/39/F.S.' cancellations. A good example of the much scarcer deep shade. (Ref 136246).