They were probably taken on Kodachrome, which was renowned for its colour reproduction (or at least its aesthetics). It's also archival quality film, so older n

They were probably taken on Kodachrome, which was renowned for its colour reproduction (or at least its aesthetics). It's also archival quality film, so older negatives don't age much if kept in the dark. It was also designed for projection so had a fairly high contrast. They're also obviously scanned, and we don't know what settings were used. Kodachrome is pretty great though, I wouldn't be surprised if they looked that nice in the flesh. That's what was truly impressive about those golden era films, they just worked. You sent them off, they got developed and they looked fantastic. There are physical differences in how film and ccd/cmos sensors record light, which may have a subtle effect. Nowadays digital sensors are superior in pretty much every way to film, and you can get whatever effect you want using post processing. The exeption is that medium and large format film is still a lot cheaper than super high resolution digital sensors.