Footnoted in: Stanley Gibbons (in appendix listing stamps either issued in excess of postal needs or not been available to the public in reasonable quantities at face value) Printing: 'Litho. (Offset lithography)' for Stamp Number
Footnoted in: Stamp Number (with price)
A pricing information is given by Yvert et Tellier for the imperforate series (see the wiki) Printing: 'Litho. (Offset lithography)' for Stamp Number
