Raglan "5-inch" Tumble-reverse gear. This gear has 26 teeth in cast iron UK made by a precision engineer. If in doubt about which Raglan lathe you have, check our article here: http://www.lathes.co.uk/raglan  Tumble reverse gears for the earlier Raglan "Little John" are here: https://store.lathes.co.uk/parts/raglan-little-john-tumble-reverse-gear