Advertising give-away letter opener or paper knife equipped WITH a magnifying lens at the top to assist reading the mail! :-)

I do not know? and could not (easily) find on "Google" which Company was the "Uni" that had paid to manufacture this GOOD QUALITY antique Advertising give-away

But it likely ceased trading many decades ago

This looks to me to be a Victorian era item

AGE = Circa 1837 - 1901

The unicorn is a legendary creature that has been described since antiquity as a beast with a single large, pointed, spiraling horn projecting from its forehead.

In European literature and art, the unicorn has for the last thousand years or so been depicted as a white horse- or goat-like animal with a long straight horn with spiraling grooves, cloven hooves, and sometimes a goat's beard.

In the Middle Ages and Renaissance, it was commonly described as an extremely wild woodland creature, a symbol of purity and grace, which could be captured only by a virgin.

In encyclopedias, its horn was described as having the power to render poisoned water potable and to heal sickness.

In medieval and Renaissance times, the tusk of the narwhal was sometimes sold as a unicorn horn.

A bovine type of unicorn is thought by some scholars to have been depicted in seals of the Bronze Age Indus Valley civilization, the interpretation remaining controversial.

An equine form of the unicorn was mentioned by the ancient Greeks in accounts of natural history by various writers, including Ctesias, Strabo, Pliny the Younger, Aelian, and Cosmas Indicopleustes.

The Bible also describes an animal, the re'em, which some translations render as unicorn.

The unicorn continues to hold a place in popular culture. It is often used as a symbol of fantasy or rarity.

In the 21st century, it has become an LGBTQ symbol.