For the first time since I took this photo in London in the 1960s, I have checked for the Ghanaian area code SG in RPWO and found no entry! –
Later: 1959 special issue to celebrate Self-Government.)
Anyone know what the SG code might have indicated, please? On the big Fiat 2100 of the period. (Answer given below by Alex Kafka, under Comments.)

Posted by Victor Brumby 