|Worcester Guildhallfigure of Queen Anne|
(ell brown on Flickr)
Although I knew there would be differences, I was surprised how many there were (see the list below - and that's not all). Now, some might argue that the differences aren't all that important; after all, the three lengths of Norman brick - 11-7/16, 11-1/2, and 11-5/8 inches - are all considered nominal 12-inch. Similarly, 3-1/2 and 3-5/8 inches would be considered nominal 4-inch.