The first year of the establishment of the Liao Taizu Yelü Abaoji was cast in the year of the Divine Book (916), and it is rare.
Coin details

Historical era:
The first type of era coin coined by Apaoji when he became emperor in 916 AD.
Money Face Text:
The face text "Divine Book Of Treasures" is read in a spin-off, without backing.
face value:
Square.
Collectible value:
The Divine Book Tongbao is the first type of year number money in the Liao Dynasty, and only 2 coins have been found so far, which is extremely rare.