Where is the official place to buy ancient coins in Tianjin?

In Tianjin, I think it's more reliable to go to a regular pawnshop in Tianjin if you want to buy antiques regularly.

At the intersection of Guangkaisi Road and Xishi Street, there is a pawnshop that must be recycled.

I think it's called Dehe pawnshop.

You can go and have a look.