lux, very interesting and intricate find.
I would advise caution. As we have so many times seen on this site and see continually on ebay, craigslist, etc.....sellers go by what they think a particular item is or have been told.
Would have to see actual silver markings to determine if it was silver, then if it was silverplate or sterling (doubt but could be).
You don't state what they are asking.