Sorry for the resurrection of this one, but thought those who watch Gardener's World (BBC uk) may see this mower (briefly) on this Friday's programme
It's included in Clive Gravett's (of the Budding Foundation Museum of Gardening) 2nd instalment on the programme covering the history of the mower.
It is also in the Atco Centenary Video on their website:- LINK within the 1950s period. So at least it's still earning it's keep with the Charity.
Regards.
Richard