A mid 20th century Swiss Atmos 'clock' with case the dial and movement signed and numbered Jaeger-LeCoultre, No 88854, Calibre 526-5A mid 20th century Swiss Atmos 'clock' with casethe dial and movement signed and numbered Jaeger-LeCoultre, No 88854, Calibre 526-5the rectangular case with lacquered brass framework sunk into the narrow polished matte base, the side hinged door opening allow for case height adjustment and to free or restrict the pendulum, the white and brass Roman dial with skeletonised centre bearing two counterpoised brass hands, the exposed movement with delicate jewelled train and Elinvar wire, terminating in an indexing platform with 'SF' and 'RA', screws blued throughout the movement, together with is original presentation case and some paperwork detailing the working of the clock, 22.5cmm high This calibre, 526-5, was manufactured throughout the 1950's. The serial numbers in 1950 began with 60,000 and it has been suggested that up to 4,700 Atmos' per year were being manufactured at this point in time. If this was the case, it would suggest a date of manufacture of around 1957 for the current clock.Walliman, A. (2017) Dating Your Atmos Clock. Available at: http://atmosclocks.com/dating.html.