It looks to be definitely a Sao Paulo rebellion mauser. The bolt handle is flat on the underside unlike other Czech contract rifles to Brazil.
These guns almost always have two serial numbers, both on the receiver. One is from the factory,the other is a number that the Brazilians put on the rifle to reserialize it into police service once the rifles arrived (unfortunately after the rebellion). All the ones i seen have the PM prefix before the serial.
Does the bolt match the receiver? They're usually mismatched due to the Brazilian habit of storing the bolts away from the rifle
Nice looking rifle by the way
There should be a serial on the back of the bolt handle like this:
But then again, it is a 80+ year old rifle and strange things happen. It could have been either ground off by the armory it was warehoused at or possibly just had the bolt handle replaced. The Brazilians refurbed a lot of their rifles many times over, this could be one. I have a Brazilian 08/34 that is a total mix master with a mix of blued and non-blued bolt parts. Its an excellent shooter though.
Here's an interesting bit of trivia, the "PM" prefix on the serial number means "polícia militar" or military police use
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