-SG- Geoff Davies, who edits the APMC magazine in UK, has kindly told me we can use this photo of his 1927 Model 19 - which he has owned since the early eighties.
Apart from the pint, I notice it still retains the twin lever, outward opening, throttle and air control. I tried using one of these for a while many years ago and could not get on with it, so fitted the slightly later type, on which the levers open inwards ... perhaps I should have persevered!