As best I can determine, these look to be U-612A No name's, but only the two darker ones. The other three which are the lighter brown have a narrower lower wire groove. Would this be a new variant to the family?

Any help would be appreciated. If these are in fact U-612A's, what is each valued as?

UPDATE 11/05/2012 : Elton Gish responded that these are all U-612 A's which follow the 612's due to the ("cut down") on each end of the wire groove as an improvement. In addition three of the five are variants, due to manufacturing, and or manufacturer but this is not so important, as the skirt shape and dimensions. To date, no U-612 or U-612 A's have been found having markings linking them to a specific porcelain manufacturer.

Thanks, Tim