GWR C/I, circular Gangers Instrument cover measuring approximately 10 in diameter. The text is pretty much the same as the later instruments we see often come to auction ' Signal Department GWR (twice) - To Obtain Key - After receiving signalman's permit turn key to no. 2 and wait until space indicates free then turn key to n. 3 - to replace key turn to no. 1. Well rusty through age but would clean up a treat and would grace any signalling collection as a true rarity. This is extremely early and the only image found is a small inset on page 118 Fig B7 of 'A Pictorial Record of Great Western Signalling' by A. Vaughan.