I have an original copy of _Buck's Theological Dictionary_ c. 1831

Some value.

It was first published in 1818, you have a reprint or subsequent edition, mostlikely. The sales price is based on the condition of the book. From the limited description, I would guess around $75.

 

In a general sense, religious books have little value as antiquities. There are so many variables - rarity, condition and so forth. I bought a first edition (US) Richard Trench Notes on the Miracles for $6.00 and Notes on the Parables for $10.00. The value of what's printed far exceeded the purchase price.

The Mrs. and I like to drive to Cooperstown and visit Willis Monie Booksellers LINK. They have over 30,000 titles online and again as many piles to the ceiling at the store. If you like old books you can get lost there for hours!

Email Monies and ask them about your book's value. You never know.