Government of India, Rupee 1, 1st issue of 1917, sign A C Macwatters, Prefix is O (letter O. Almost UNC, Very Rare as the Prefix is O which resembles with letter 0 (zero). For an authentic survey of all the Prefix and their occurrence on these notes, refer the excellent article of Mr. Rezwan Razack in Gullak, Year 1, Issue 3, November 2009.