Transport & General Workers Union T.G.W.U. 3rd Quarter badge

A very scarce original circa early 20th century period 'Transport & General Workers Union 3rd Quarter trade union lapel badge'; small brass circular example with embosssed '3' within 'T.G.W.U.' V shape, band across the centre impressed with number '301'; the reverse impressed with a '5'. Good condition, complete with original buttonhole lapel fitting .Diameter approx 21mm.