After looking closer at the picture of the top of the reciever it is marked 135 byf thanks for pointing that out! Mauser k98 byf 1943 | Flickr - Photo Sharing!
now I know what rear sight I need to get!.
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Thanks for the ingfo guys! good or bad its all good, i found this link if anyone is interested thanks to vintage hunter he pressed me to look around thought it was informative! maybe someone can use it as follows,
detailed_listing_of_german_waa_markings_and_codes
135 sure enough! as follows 135 byf K98k, P08,P38, MP44partsMauserwerke Oberndorf(NW)1941 – 45
good cross refference information! covers alot of info.