Gabon: Transgabon airmail labels full sheets 2

Here are 3 more very rare sheets of Gabonese labels, issued by Transgabon! These are imperforated varieties not mentioned in catalog. Also Yellow color not in catalog yet.

Year: 1959, Gummed. Günter Mair's catalogue no: - GAB-B-1a, imperforated , sheets of 4(2x2), black/grey-green, 5***** 

Year: 9.1962, Gummed. Günter Mair's catalogue no: - GAB-B-1b, imperforated , sheets of 4(2x2), black/salmon, 5***** 

Year: ?, Gummed. Günter Mair's catalogue no: - GAB-B-1c?, imperforated , sheets of 4(2x2), black/light-yellow, 5*****