www.925-1000.com

I have a Carl Deffner Wine Cooler. I identified the makers mark but I don't know if it's silver or silver plated.

Hoping someone can tell me if this is silver or silver plated. https://photos.app.goo.gl/ZNG4XaTD3AXYASbh8

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Silver plated made out of a non precious base metal.
In 1923 Max Deffner (1900–1985) joined the company as managing director; In 1928 his cousin Erich Deffner joined them. In the 1930s it was mainly nickel-plated, chrome-plated and silver-plated tableware and metal-porcelain tableware that were sold. During the Second World War , metal crockery was mainly produced, and in the post-war period, the company switched to the production of costume jewelry and similar items from scraps of material.
https://second.wiki/wiki/c_deffner

German items made out of solid silver alloy:
German hallmarking system was unified in 1888 (Decree January 7, 1886) adopting the national mark "Crescent and crown" (Halbmond und Reichskrone) for silver and the "Sun and Crown" (Sonne und Reichskrone) for gold.
Silver fineness is expressed in thousands with a minimum silver content of 800/1000, but 830, 835, 900, 925 and 935 purities are also used.
The alphabetic or figural maker's symbol complete the hallmark.
This system, still active in present days, is used for cutlery, plates or other silverware. In the area of silver jewelry only the silver content mark is more often present
See:
https://www.925-1000.com/Fgerman_marks_a1884.html