I have many older vintage guns that I have carried for short periods. But as soon as I sweat, they lose value. So out come the Glocks, which have not rusted (although I would not care). I can't even keep a stainless gun from rusting in this weather.
My 1927 S&W .32 Long Regulation Police finds it's way into my vest pocket when I go for extended rides on my Harley. The I frame is lightweight, the 4 and 1/4" barrel is extremely accurate and when filled with flat point bullets will do the job, if needed.
S&W 1917 .45 Auto Rim that already had its J frame adjustable sight when I bought it in 1975. I had its barrel shortened to 4" in the late 1980s. It still stands proudly beside my .45 ACP Mountain Gun.
Oh yes, there's the modern high power hunting rifles, 1903 Springers, 1917 Enfield & Mausers. The oldest model rifles I recall hunting with were an 1891 7.65 mm Mauser and an 1895 Winchester in cal. .35 WCF but either could have been manufactured after a WWI 1903 that's still in use.
I have a Colt 1905 Model .45 that was passed down through the family. But, I don't really carry it. I have Colt Cobra made in 1966 that I carry at times.