Unknown Semi-Flex Swan Metal Fountain Pen

I took a shot in the dark a few month ago and bought a vintage pen lot from Germany. Unknown to me at the time, I had many early Soennecken's and this amazing Swan which I thought may of been silver. I don't think its silver, as it has no hallmarks and doesn't have that certain 'glean' like my other sterling silver pens. No numbers on the bottom or anything, just a name on the name plate. Any help would be appreciated.