When a letter of attorney to sell and dispose of lands is acknowledged or proved and the acknowledgment or proof is certified and it is recorded as required by law, a deed may be acknowledged by the attorney in such letter, in any county, before any judge of this State, or notary public, or 2 justices of the peace for the same county, if the letter of attorney authorizes such acknowledgment. An authority to sell or dispose of premises, if not restrained, shall extend to authorize the acknowledgment of a deed therefor.