Lübeck city thaler from 1620-1638 - described in catalogs as DAV#5449 and KM#54 (1620-1627) and DAV#5449B and A60 (1627); DAV#5449C and A61 (1627-1635); DAV#5449D and A65 (1634-1638) with the coats of arms of the mayors on the sides of the shield with the city coat of arms - Alexander Lüneburg coat of arms (1609-27) - tower, then Lorenz Möller (1627-34) (gate?), and Heinrich Köhler (1634-41) (acorns).
Do we treat it as 1 type (with 4 varieties) from 1620-1638 or separate it into 4 different categories?