There are four types of edges of coins-
(a) Reeded Edge (Milled Edge, with cross serrations on Rim).
(b) Plain edge (No mark on Rim).
(c) Security Edge (with a deep Indentation on the Rim as if in Two parts).
(d) Oblique Edge (with serration at an Angle of 30°-45° to the Rim). During the period 1835-1947, coins with first three types of edges have been issued.