For a college project, I'm making a short film that's a spoof of '60s-era spy movies. The thing is, I haven't actually seen a lot of classic spy movies. As of now, my spoof is based on other spoofs/homages like the Incredibles and Cars 2 (hey, I actually enjoy that movie!) But I feel like in order to make a fully successful project, I should be more familiar with the actual source material, not just other spoofs. Otherwise it's a copy of a copy. What are some 'definitive' '60s-era spy movies? I don't need an exhaustive list, just maybe 3 - 5 that I should watch for inspiration. And they should be ones that contain a lot of tropes and imagery associated with the genre. (Also, they don't have to literally be from the '60s, but they should be from that general era. No Jason Borne or anything like that).