Post pics here or even better at ...
http://forums.gunboards.com/forumdisplay.php?f=6
The guys on the K98 forum there are incredibly knowledgeable about K98s and their variants. Im paticular the mod on that forum "Hambone" and another member who specializes in SS marked rifles, by the name of "ScottB".
They will give it to you "straight no chaser" regarding the authenticity of your rifle.