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The "Hamburg ring" seals the deal for me, the Gottas say it too.
Glad you like it, my Gotta sings like a canary too.

I might be leading you up the garden path but here is a 15/6 or 8/8 Gotta
http://straightrazorpalace.com/razors/96276-find-lifetime-8-razors-die.html
275634

I wouldnt worry about the marks as they dont sound like active rust, could just be patina.
As Grazor said looks just like a Gotta.