Here is the safe way to find the value of your vise (and get ALL of the money):
Take really high quality pics, 800x600 or higher resolution, put it on ebay for a 10 day auction, starting on a Thursday at ~10:30PM Eastern time for maximum exposure (this will cause the vise auction to end on a Sunday at 10:30 PM - ebay's peak time) - if you are not an established seller on ebay with a feedback of at least 50 at 100% satisfied, then have a friend list it who is. Include the links to the patent info. in the auction listing.
Start the auction at $1
with no reserve, don't worry, it won't sell for $1, but instead, every vise collector on earth who would pay big bucks for this vise knows about ebay and checks ebay nearly daily and will see it, especially with the low price, and with everyone in the world with potential interest seeing it and bidding on it due to the $1 starting bid, a frenzy will ensue and cause every more attention to it, the auction will get the ebay "hot" flame symbol and the auction will end with a price that is absolutely all it is worth, as every deep pocketed vise collector will have seen it!
Remember, the definition of what something is worth is what someone will actually pay. This is what makes ebay sold items the most accurate appraisal service on earth!
Source: I have used this method to get record prices for a number of collectibles on ebay
