One of the cells in my Thompson Bros casket set has three elements instead of two. It exhibits such stunning coma that I can only assume it's been done on purpose - especially since there is another cell with exactly the same focal length.
I really like the coma too !! I have a Busch Vademecum Satz No.2 casket set myself that I need to play with but I am really impressed by the coma exhibited here. I also don't have the directions for my set as to the combinations of lenses.
Joseph, I have the instructions for the Busch set.
But it doesn't include such a "comatose" cell as this one, unfortunately - the Busch set is pretty sharp in most configurations, but quite decently awful in the wide-angle setups.