Hello,
I am sharing this information here for future reference. Thanks to Stratocaster for his precious help. It would be great if the general referrees could add this information somewhere where it can be found.
Pfennig (12-15th century)
1 Angster = 2 Pfennig = 4 Hälbling (Haller, Stebler)
Guldiner (15th century-1579)
1 Thaler (Guldiner) = 2 Breiter (Halbthaler) = 3 Dicken = 17 Batzens = 22⅔Groschen (~ 36¼ Plappart) = 68 Kreutzers = 108⅘ Fünfer = 272 Angster = 544 Pfennig = 1088 Haller (Hälbling, Stebler) • 1 Groschen = 3 Kreutzers = 8 Pfennig • 1 Plappart = 3 Fünfer = 15 Pfennig • 1 Vierer = 4 Pfennig = 8 Haller (Hälbling, Stebler) • 1 Ducat = 1 8⁄9 Thaler • 1 Sonnenkronen = 21 Batzen = 1 4⁄17 Thaler • 1 Gulden = 15 Batzen = 15⁄17 Thaler
Thaler (1622-1642)
1 Thaler = 3 Dicken = 17 Batzens = 68 Kreutzers = 136 Vierer = 544 Haller • 1 Ducat ~ 2 Thalers
Neuthaler (1760-1798)
1 Neuthaler = 2 Gulden = 4 Franken = 40 Batzens = 160 Kreutzers = 320 Vierer • 1 Ducat ~ 2 5⁄17 Thalers • 1 Dublone = 2⅕ Ducats ~ 4 1⁄17 Thalers
Sources :
J. Simmen, Die Münzen von Solothurn, Vol. 1 (most info is from here, others less useful)
M. Matzke, Die Frühzeit der Solothurner Münzprägung
M Körner et al., Währungen und Sortenkurse in der Schweiz