supply of gold plated silver medalgold plated silver medal,gold plated silver medal with embossing of indian railway monogram with 17 stars on one side (annexure- a-1) south central railway presented on retirement (b oth in hindi and english) with engraving of continuity serial no. on other side as per an nexure- a-1. 1] weight of silver - 20 gms. [plus /minus 2 percent tolerance], 2] silver purity of 99.9 percent , 3] diameter of medal: 1.5 inches, 4] 0.5 micron thickness of gold plating on the silver medal, 5] medal to be displayed on two aluminium pillars of height 50 mm, diameter 19 mm at bottom and 12 mm at top and to be fitted in transperent fibre box as per annexure a-2 . note: tolerances, wherever not indicated, shall be as per is.2102, par t - i and part ii [medium tolerances] ]