This Mauser seem to be a 1904 Mauser-Vergueiro without Portuguese military  markings, other than German commercial proof marks. (proof marks on receiver show 7mm caliber) Caliber is 7mm (7x57) also marked on sight base.

Not marked as A  Federal Police 1910 conract  7 MM (F.P.D.F)  Circle around the B seems to be a Brazilian proof ?

Has hinged floor plate. Barrel is identical configuration to a M-1909 Argentine, (29 inch) Was covered in black paint and stock cut down., Was missing the cocking piece and safely and bolt shroud (found these parts)

Looking for original full length rifle stock (not 1904/39 carbine stock).

 Found a   couple  of  stocks and  made    this  fit.

Info points to a Salesman's sample, used to gain the contract for the  Brazilian Police in 1910.  Some information also points that some of these were made  for Siam.

Looking for some more info, reference and pictures on this type  rifle.

Found a M-1904 in 6.5 Portuguese a few years back at a show, also was sporterized.  Took several years to find all the parts (stock especially). Was really neat because Portuguese Crest was scratched out and  Dominican Republic markings were added. 
Still haven't found any ammo for the 6.5 .

Thanks all
David