"The serial numbers of the guns sent to Brazil are mixed ranging from 1 to 210,000." (Roy Jinks)
First Brazilian Contract Group, shipped beginning in 1938,
serial number range
...
181983 to 207043
Second Brazilian Contract Group, shipped beginning in 1946,
two serial number ranges
...
166,000 to 175150
...
207,196 to 209878
The above is approximate; note that I have a Brazilian with the serial number 165xxx, which is outside the '38 and '46 ranges.
Roy's letter says mine was shipped in 1946.
This information was gleaned from:
1. A couple of Roy Jinks letters in my possession
2. The SCS&W by Supica & Nahas (see pages 163-165).
Hope this helps.