I've just received a .458 high grade FN, made in Belgium, Browning rifle. Mauser action. It's almost new condition except for some gun safe marks. The person that I got it from bought it in 1975 and said he shot it exactly twice and said it kicked his butt. He put it away and never fired it again. SN# 2X143xx. Lots of engraving, floorplate and triggerguard has gold fill of an Ibex or maybe a sheep. Right side has the following: Browning Arms Company St Louis Mo & Montreal PQ. It has a silver shield with an initial on the bottom of the stock. Any help on the age, model and value would be appreciated. I can post photos if needed.