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The recipe above is 2 1/12 oz (62.5ml) gin to 5/12 oz (12.5ml) dry vermouth, so is correctly labelled 5:1. My larger serve 2½oz (75ml) gin to ½oz (15ml) vermouth is also 5:1. Please see this page for our 4:1 and other Martini ratios: https://www.diffordsguide.com/g/1121/martini/dry-martini-ratios