Silver marked .950 is an example of the first French millesimal fineness of 950/1000, and silver marked .800 is most likely a coin-standard silver obtained by melting silver coins. Assuming the specimens are of equal weight, the .950 specimen is more valuable.
The .950 French alloy is 95 percent silver and 5 percent copper or other metals. It is among the highest ratings possible for silver and qualifies as being considered sterling.
Silver marked .800 has a fineness of 80 percent silver and 20 percent copper or other metals. Fineness levels of .800 to .850 also are common for platinum. A platinum specimen should have a stamp of the letter P or the word platinum indicated.