While it was discovered in January 1996, it passed closest to Earth in March 1996, making it visible to the naked eye in the Northern Hemisphere. It was a spectacular sight with a long, bright tail.

However, there were other comets visible around that time, though not as notable as Hyakutake. To clarify which comet you're interested in, please provide more details like:

* When exactly in 1991 did you see the comet? (Early 1991, late 1991, specific month?)

* What did the comet look like? (Bright tail, faint tail, color, size, etc.)

* Where were you when you saw it? (This can help narrow down which comets were visible from your location)

With more information, I can help you identify the comet you are thinking of.