Last seen 61 years ago. An early Blipper?

Several papers from 1952 were padding the painting in its frame that we re-housed this morning. Fascinating articles include the first hearing of the enquiry into the major rail collision at Harrow in that year, and this article about an early blipper. Using a Leica that cost £140 then, a substantial sum, considering the average weekly wage was £9.0.0. Try large.