I find it interesting that Peru chose to special order a Model 19 with fixed sights. I get that the Peruvian Police wanted the shrouded ejector rod, but it seems that they could have ordered the Model 581 which was the fixed sight L frame and geared towards the police market that wanted a fixed sight .357. It had plenty of barrel mass to encourage miscreants in lieu of the application of a sap. The 581 was discontinued around the time the Model 19-P's were ordered.

Perhaps there were no more available, or the Peruvians didn't want to have to purchase all new leather gear, or maybe they just liked the lighter K frames.