Fountain Pen ID Request

[Ami2014]

I was digging through my stash of pens the other day and found a fountain pen that I forgot I've had since I was a kid some 20 years ago. 

 

The only thing I could find online about this pen was here https://www.invaluable.com/auction-lot/patronenfueller-und-kugelschreiber-st-bernard-2820-c-ea34d95aa9?srsltid=AfmBOoobnxERCFdQUzPFGhGw7_8nn0fbvB11cjJ6IqQSGqSdLxtMLLWx

The fountain pen looks exactly like this in every regard expect for the top of the cap. On the Germany auction side it says the top of the cap has the relief of medusa on it, however on my cap it seems to be the Swiss flag symbol. 

 

Is this fountain pen worth anything or is it just a cheap knock off?

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