centimental

A person who gets sentimental over their coin collection.

I was a centimental when I collected state quarters. I really loved them.

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centimental value

A strong attachment to a family heirloom due to one's either being able to make a significant income from da ownership/use of said precious object, or knowing dat it will fetch a "pretty penny" if put up for sale.

If someone claims to have a special emotional attachment to an item at an estate sale --- especially if said object is of considerable value --- it's entirely possible dat he really means dat it is "of centimental value"; i.e., dat it would be worth a lot of money to the right buyer, and so he is merely wanting to selfishly turn a tidy profit by selling it.