very interesting. Yes, here in Central Europe you stumble across these ARG800 sets quite regularly. They also pop up on auction platforms etc.
Your set has quite a distinctive pattern, different from the normal ARG800 type. And it appears your 800 mark is stamped. Usually the ARG800 mark is part of the casting, raised. You are right, the bubbles are disturbing, indicating a base metal and a plating.
For the benefit for the forum, can you post sharp pictures of the marks, and pictures of whole pieces, forks, spoons etc?
And, can you sandpaper deep in the surface where the bubbles are, until the base material is exposed in large? Then make the test there.
It is possible this is an .800 silver set, just cheaply made (such items were produced in the 1950ies), however they should not be very heavy. As you may be aware, most .800 silver sets are galvanized with 100% silver so they do not look reddish, but silvery. So a loose galvanized layer on an .800 silver piece could be possible. However, I have never seen anything like this.
It doesn't stay good forever and the silver testing acid usually goes bad faster than gold acids.
Traintime wrote:The trail on that leads to Allessio Cesa & Company, legitimate silver makers. Crown trademark. Any chance they were also engaged in silverplate work?
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