As others have said it looks like 800 (80%) silver to me
Sterling (925 silver) can be run "direct" in a silver cell - it will just corrupt the electrolyte with copper sooner then with cement silver anodes - which only means you ether need to change out the electrolyte sooner - OR - start with MORE dissolved silver ions in the electrolyte so that it takes longer to "up set" the balance between the silver ions in the electrolyte & the copper ions in the electrolyte
In other words - copper "co-depositing" at the cathode in the cell does not start to happen until the balance between the silver ions in the electrolyte & the copper ions in the electrolyte get up set
So (as an example) say you are running cement silver anodes (which should be "about" 985 silver or better) & say you make your electrolyte with 100 - 125 grams dissolved silver per liter of electrolyte - you can run those cement silver anodes "relatively" longer then running 925 (sterling) anodes because the higher copper in the 925 will up set the silver/copper balance quicker then the 985 (plus) cement silver anodes
However - if you up the amount of dissolved silver in the electrolyte from 100 -125 grams per liter - to say 250 - 300 grams per liter you can run 925 (sterling) anodes longer because the electrolyte can "take on" more copper ions before upsetting the silver/copper balance in the electrolyte
With 800 silver - the copper content is so much higher then 925 that in order to (effectively) run it direct in a cell you would have to have A LOT of silver dissolved in your electrolyte &/or change the electrolyte out VERY often
You are better served to dissolve the 800 & then cement the silver out of the silver(copper) nitrate & pour cement silver anodes
My point is that you can run 925 silver direct in a cell - not so much true with 800 silver
For what it is worth
Kurt
