Fortunately the shanks more often than not have the maker and the needle size. Needle size and application can be found in the old sewing supply catalogs: (page 24-30)
30-40 cotton---size 18
40-60----------------16
60-80----------------14
80-100---------------11
http://www.sil.si.edu/DigitalCollect...0773/index.htm
Jon
Last edited by jlhmnj; 08-14-2014 at 05:08 PM.