It is possible to get an Opinion of value from many sources; most of which will vary from each other- sometimes greatly.
I would suggest you look at the online sights of large luger sellers, like Simpson's and Legacy ; also online auctions that actually sold.
Many of us don't do value estimates, how, where, when you sell all affect the selling price.
Sorry not to be more help, but I'm tired of being told my "value" estimate is wrong !