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| 1924 kiosk design by Sir John Burnet | 1924 design by Sir Robert Mortimer |
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| 1924 design by the Birmingham Civic Society | 1924 design by the Metropolitan Boroughs Joint Standing Committee |
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| Prototype of K2 - adopted kiosks had no door lever or Georgian glass | K7 - field trailed but was not adopted as aluminium did not weather |
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| Prototype kiosk with stamp vending machine in rear - became the K4 | Same prototype - side view |
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| Exterior view of K6 with connection strips in rear |
Interior view of K6 with connection strips in rear |
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| K6 with strips connection in rear | The same K6 on the street |