Value estimates:

The Westcott quotes are “mid range” from the 1999 issue which has updates for every jug in the earlier 1991 book, as well as a 1999 AU$/£ currency converter. In all aspects of a price guide these prices are outdated and only really functional as a rarity comparrison guide.

My own estimates are based on average prices seen at auctions and on eBay, as well as what I have paid myself. Where little information for a specific jug is to be found it is more a “questimate” based on several general criteria like brand popularity, age, maker and numbers they usually produced etc.