If such deed be executed in any foreign country it may be executed according to the laws of such country, and the execution thereof may be acknowledged before any notary public therein or before any minister plenipotentiary, minister extraordinary, minister resident, charge d’affaires, commissioner, or consul of the United States, appointed to reside therein; which acknowledgment shall be certified thereon by the officer taking the same under his hand, and if taken before a notary public his seal of office shall be affixed to such certificate: Provided, That all deeds of land situated within this state, heretofore or hereafter made in any foreign country, and executed in the presence of 2 witnesses, who shall have subscribed their names to the same as such, and the execution thereof shall have been acknowledged by the persons executing the same before any 1 of the officers authorized by this section to take such acknowledgment, and such acknowledgment shall have been certified thereon, as above required, shall be deemed between the parties thereto and all parties claiming under or through them, as valid and effectual to convey the legal estate of the premises therein described; and whenever such deed has been recorded in the office of the register of deeds of the proper county such record shall be effectual for all purposes of a legal record, and the record of such deed, or a transcript thereof, may be given in evidence as in other cases: Provided, That nothing herein contained shall impair the rights of any person under a purchase heretofore made in good faith and on valuable consideration.