The following is an excerpt from my English textbook:
These beautiful hats are replicas of Gwanmo. The kings of Korea often gave them to local leaders as rewards for their loyalty. The hats are well-known for their delicate patterns.
I wonder what "them" refers to. Is it "these beautiful hats" or "Gwanmo" (meaning: a crown hat in Korean)? Those "beautiful hats" are not originals but just replicas, so does the pronoun "them" refer to "Gwanmo"? Or, as "Gwamno" is a singular proper noun, does "them" refer to "these beautiful hats"? I'd like to know if a singular proper noun could use a "them".