Here are some notes on Brazilian Contract Serial Numbers:
First Group, 1938+, 25,000 units, serial number range
181,983 to 207,043
Second Group, 1946, 12,000 units, serial number ranges
166,000 to 175,150
207,196 to 209,878
Gleaned from letters written by Roy Jinks and The Standard Catalog of Smith & Wesson by Supica and Nahas)
Has round top and round sight notch. Barrel marked “I.N.S.”. Has grips like a modern M10. No provenance , bought at auction on a whim . Will try to post pix later .
Has round top and round sight notch. Barrel marked “I.N.S.”. Has grips like a modern M10. No provenance , bought at auction on a whim . Will try to post pix later .
The "I.N.S." barrel is a replacement barrel built in Brazil. I understand they shoot fine.