GNR cast-iron mechanical slot indicator, complete and in ex-box condition, clearly embossed inside GNR. L 77, marked Grand Sluice, Down Main Distant, On 1 Off'. In full working order with all bolts freed and oiled. Together with a GNR 2-gallon, paraffin can, stamped G.N.R. and with brass plate G.N.R. 1854, in remarkably good condition, complete with brass stopper, also stamped G.N.R.; the tin-plate repainted black.