Mechanism No. 13
|Early A and B coin recognition mechanism.
Note that the buttons are actually labelled A and B and early casings had no A and B markings on them. The GPO soon realised that people were not seeing the letters on the buttons and quite early on they marked the casings with A and B in white paint.
This mechanism was superseded by the Mechanism No. 14 which had a small row of connectors to the lower right of the mechanism, instead of the large brass studs on the left.
The pictures below were all dated 1926.
Last revised: July 19, 2020