Welcome to the crowd searching for a " Unit Disc " . They are rarely found except mounted on a stock . Auction prices run $50 to $100 each , depending on the number of interested bidders or the particular unit markings . I believe I have seen only 2 at auction in the last year .
You will soon find out that Poyer's book is full of so many errors that it is not worth the paper it is printed on .
The only source for correct info on the subject is " Crown Jewels - the Mauser in Sweden " by Dana Jones . Buy this book before you purchase another Swedish mauser . It is worth far more than the $40/$50 price tag .