I have something of a similar situation.
I have a Mauser that I inherited from my father and he, from my grandfather. Mine has double set triggers and a lever open magazine. I believe that this rifle is a type "B" mauser sporter. Its original stock was a schnabel type that my grandfather broke and replaced himself. He also removed the original rear sight and replaced it with a receiver sight. The stock and sights are part of the standard way of identifying such rifles, and without them its rather difficult.
That book on mauser sporters looks interesting, but at $90 US, I`m a little hesitant to buy it to answer one question. From my signature you can see that I normally have little interest in bolt action rifles. Too bad there isn`t a lending library on firearms books out there somewhere.