From Ludwig Olson's "Mauser Bolt Rifles" this looks to be an altered Special Range Rifle although of course could have been ordered with a sporterised shortened stock sans the hand guard normally fitted but retaining the black horn forend cap. This variant of the 98 Mauser had a tangent rear sight as well as "a collapsible peep sight fitted to a square-top receiver bridge". It was made between the wars in 30-06 but could be had on order in any regular Mauser caliber.