![]() ![]() ![]() I think this number is more likely to be the serial number. This index value aims to quantify relative rarity within a watch company's production, independent of the absolute rarity that modern collectors often discuss.Īll rarity index values are calculated within the context of grade, size, model, and configuration classification and then normalized using standard deviation. We have an upright piano from Washburn/Lion&Healy with the only visible numbers being. The PWDB Relative Rarity Index is a statistical metric representing the rarity of a particular grade within the context of the total estimated serialized production from a single company. This index can quickly identify which movements represent common or uncommon production using real-time statistical methods to analyze relative rarity.Įxample of the PWDB Relative Rarity Index for the Elgin Grade 91Now displayed on most serial number lookups on the Pocket Watch Database The PWDB Relative Rarity Index aims to provide a quantified metric to convey how rare a particular movement is within the context of total serialized production from the factory. Elgin Grade 91 Movement, 1.11 PWDB Relative Rarity Index
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