One of the first things I'm sure you noticed in the p[ictures is that this film expired in 1968. It is unopened, factory sealed, and still possible to use 1968-expired Kodak 4-X Reversal Film (Type 7277). It should be considered a specialty, artistic, or experimental project rather than for high-stakes, once-in-a-lifetime shooting. Because this is black-and-white reversal film, it has a better chance of success than 1960s-era color film.
 
Tips for Using 1968 Film (50+ years expired)
- Overexpose Heavily: As a rule of thumb, add 1 stop of exposure for every decade expired. For 50+ years, this suggests 3–5 stops of overexposure.
- ISO Adjustment: Since 4-X is natively rated around 400 ISO, you should likely shoot it as if it were 25 or 50 ISO (effectively treating it as a very slow film) to overcome the fogging.
- Test Roll: Do not shoot a once-in-a-lifetime event with this film. Shoot one roll and have it developed to see how it performs, then adjust your settings for the next.
- Developing: Standard reversal processing (reversal B&W) may result in very dense or black frames. Some users have success overdeveloping, but it is often better to treat it as a negative (treating reversal as a negative) to get a usable image.
- Handle with Care: The film base may have become brittle over 50 years, so ensure your camera has a gentle transport mechanism. 
- It is highly likely to produce "funky" or "artistic" results, which can be beautiful, so if you're after a unique, vintage, and experimental look, go for it.