Frederico,

I can't tell from your photo if this is a real or fake Zeitner mark, although it does appear to be stamped. I noticed that your photo is the same one you posted in Kingtiger's thread "Goering Wine Carafe from Carin Hall" from last year. In that thread JWotka posted a photo of a silver bowl with a Zeitner mark which appears to have a special stamp along with a 935 silver content.

What is the reason for the repost? Maybe I can help.

Best regards,
Carinhall