This has a broken vacuum actuator.

This is a new old stock Hitachi carburetor parts number 16010-33M23

From my research this fits 1985 through 1987 Nissan Sentra and Pulsar NX manual transmission cars.

This carb has been in storage for many years, the original box is trashed, and it looks like the carb was dropped at one point because the plastic vacuum can has 2 broken hose fittings, I assume the whole can will need replacement, but you may be able to repair it with the proper adhesive.

There are a few little rust spots on the carb itself but it looks like you should be able to use it as is except for the broken actuator.

This is a real original equipment carburetor not a cheap Chinese replica.

Thanks for looking.