It could be an M48, It is hard to tell from the photos.
Check the spacing on the mounting screws, on a standard length K98 they would be a hair under 20cm, on an intermediate M48 they would be a little closer together, about 19 1/3cm.
On Edit: What has me confused is the location of the serial number. On most European Mausers, it is on the left side of the receiver, on yours it looks to be on the right.
Last edited by emcon5; January 9, 2013 at 07:03 PM.