Well, let’s see (not all BUGs, but all in current use):
> Pre WWII (1937) Colt 1911A1 – still a fantastic sidearm, with many decades of flawless performance remaining
> 1942 Colt Model 1903, hammerless .380 (an excellent BUG)
> Not 50 years old yet, but getting there: My early ‘70s S&W 27-2 – P&R’ed, beautifully blued, five-inch barrel, splendidly accurate, durable and reliable, made with superb quality – my favorite firearm, which I hope will be used by my heirs a century from now