Here are the Finnish quality standards throughout the years.
800, 813, 830, 875, 916, 925 and 999.
The quality marks 813, 830 and 916 can before the year 1972 have the letter capital H added in the end i.e. 813H. H stands for the Finnish word for silver i.e. “hopea”.
The current (EU) standards are 800, 830, 925 and 999.
I many books among that Tardy (page 117) I have seen stated that the quality marks 813H, and 916H actually indicate such as 813H=830 and 916H=935. That is complete nonsense. The figures represent exactly the quality in parts of thousand (promille) they show since the year of 1891.
Before 1891 the quality was expressed I lots with a minimum of 13/16 (812,50/1000) but qualities of 13,25, 13,50, 13,75 and 14,00 were also used from time to time.