How old are Al Hollern signature golf clubs?

My Dad has an Al Hollern signature go-sum putter "10" iron. It has a hickory shaft. He is 74 & doesn't play anymore. It belonged to his mother's brother-in-law who was born around 1900. I wanted to maybe clean it up & mount it on a wall at the folks' home. Any idea on how old this vintage piece of equipment is?