F.W. HYM AG was first esablished his gun works 1865 and located near Gleichamberg, germany since 1995 and Sterling VA. imported by Heckler & Koch and JagerSport They are best known world wide for their combination guns, over and under or SxS in .375, .458 Win, .470 &.550 nitro express. They are also known for their top end drillings and bolt action rifles originally built off mauser war surplus rifles available in 18 calibers the SP-10 sporter and SR20N classic. The SP10 is worth $1,325 in 100% -$850 in 90% which is inexpensive compared to the before mentioned combo and drillings that can run as high as $25,000. They also have a line of Express rifles worth up to $22,000
Your rifles worth can be found in the annual blue book of gun values for 2012 as I mentioned last years. They have safari rifles worth up to $50,000 and veirlings-4 barrel configuration rifles worth up to $37,000. Since your basic moel the SP10 is worth between 1350-850 you should hold on to that rifle and take care of it.