As you likely know the Dakin Family were instrumental in opening the US market for Grulla - one might say that they were the catalyst and necessary agent to achieving this.  I owned a 209E Grulla boxlock and found it to be very well made with excellent handling characteristics.  It is now in the possession of a friend who hunts ruffies occassionaly.  I sold the gun to him for $500 - a steal no doubt.  I don't believe that Grulla makes boxlocks any longer.  So as to value - if the gun fits and the condition is all you hope for appraise it on that basis.  I know that I would love to have mine back for it is a terrific upland game gun with skeet and improved cylinder chokes, nice wood, and appropriate fit.  Would I pay $1800 to get it back - No but I would pay $1200.  I believe that you will find some variance in quality in the early guns so assess each guns on their own merits.  Current offerings by Grulla are all sidelocks.