You are right to identify the later coins as having larger teeth, and the changeover did take place in 1914, but I find it a lot easier to use pointings as they are independent of wear and require less judgement to come to an identification. If you are interested in this level of varieties, I cannot recommend Dave Groom's books strongly enough... 1914 florins have three reverses: Rev C (1913-1914) Crown on harp's shield points at a bead N of FLORIN closer to shield L of FLORIN between beads F of FLORIN below L smaller beads Rev D (1914 only) Crown on harp's shield points at a bead N of FLORIN equidistant between shield & beads L of FLORIN between beads F of FLORIN below L smaller beads Scarcest Rev E (1914-1924) Crown on harp's shield between beads N of FLORIN very close to shield L of FLORIN points at a bead F of FLORIN level with L larger beads Commonest hope that's helpful!