20" Bismarck/Bismark chain marked ISC, Italy, 925, and PR.  One side has a more matte finish and a subtle texture and the other is flat and shiny so you could wear it either way.  Tried to get pictures showing both finishes but it's hard to show the detail.  Has a spring ring clasp that is in good working condition.  There is a spot where it has a slight wave in the chain - maybe could be flattened out but it's not very noticeable when the chain is hanging.  Weight is 11.38g.  Very nice chain with some versatility.
Please let me know if you have any questions and thank you for looking!