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The pics are NG for a positive ID, but suggest you have a sporterized military Mauser receiver, that's had all it's markings scrubbed except for the SN, the bolt handle altered lower to clear a scope, a low-scope safety installed - then rebarreled, polished, reblued, restocked & scoped.
The best ID would be to see if the headspace is OK & if it shoots good.
You don't really need to know the maker & the DOM to effect any future repairs or alterations, since a 98 Mauser is a 98 Mauser is a 98 Mauser.
AFAIK, The only item that differs between different M98 Mausers (unless the barrel's to be replaced) are the FP's.
If you ever break a firing pin, just measure the length before ordering, since various length actions require different length FP's.
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