I've read Siemel's own books and those about him by Julian Dugood, if I spelled that right. The author (Dugood) was British. He visited Siemel in Brazil.
The famed hunter emigrated to Brazil from Latvia at the time that Russia seized Latvia. I forget the year, but it was about 1917. He worked as a mechanic (including being a gunsmith) and as a wrestler before achieving fame for killing big cattle-slaying jaguars.
He never mentioned the model, but was fond of Smith & Wesson .44's. These could be anything from old top-break models to Triple Locks or the Second Model Hand Ejector and 1926 Third Model. Siemel may well have owned several models. He mentioned the .44's carried by others as well as his own guns. The one he's wearing crossdraw in the above photo is probably one of those .44's. The barrel doesn't look long enough for the .357 in the other photo. But it's about right for a 6.5-inch .44 Second Model. And that was probably what he'd have found new after arriving in Brazil when he did. Moreover, he looks too young to have had the .357 yet.
Doug Wesson was an admirer of Siemel, who wrote books and gave lecture tours in the US. I understand that he also received a new .44 Magnum when that was introduced.
Because Siemel also used .44 Winchesters, I suspect he MAY have had S&W .44/40 revolvers, for ammo commonality. The cartridge was very popular in Brazil. I don't know if the .44 Special was widely used there.
He certainly had some connection to PA! He met his wife there while on a lecture tour. She was about 18, and he was about 38-40 at the time. She admired him as a giant of adventure and attended one of his lectures and met him there. They had several children and there is a picture of the girl, a pretty brunette, with a bow and arrow and a caiman that she'd arrowed in Brazil. (A caiman is similar to an alligator. Alligators do not live in Brazil. In his books, Siemel used the Brazilian name of "jacare" for caimans. I don't think that "jacare" is a Portugeuse word; it is probably from some Indian language.)
Siemel was a remarkable man, and deserves to be better known today. I found out about him because my junior high school had one of his books, as did the public library. I recommend his, "Tigrero!", if you can find a copy, or his other books and those about him. I was very fortunate to locate a copy of, "Tigrero!" in a used book store. I value it highly. I'll probably pass it on to my son. (Please don't ask to buy it.)
Although he often used guns, it is true that he frequently speared big 400 pound cats in high grass. He forged his own spearheads, and was taught to use the spear by an old Indian named Joaquim Guato. (I can't do accentos on this keyboard; there is an accento on the "o".)
If you've ever wondered whether piranhas (caribes) eat men, read his books. They will. In fact, I think the name "caribe" was derived from the voraciousness of the fish reminding early explorers of the Caribe Indians, who were cannibals.
GOOD post! I loved the photos.
T-Star