I just purchased 2 Hummel Figurines at an estate sale. Are they authentic?

One has a gold foil sticker on the bottom but is not marked other than that. I found out that he is called "little Hiker" and the other looks like a boy playing the cello. They do not have any of the Hummel markings. Only the "little hiker" has the gold paper sticker that says "Hummel" and some other stuff, it's kinda worn. Also the cello boy looks like it had green felt on the bottom at one time but not any more, and there is a couple of un-readable halmarks maybe on the top of the base by his feet. Any help whould be appreciated. Are these authentic? And how do I determine when they where made?