I turned these up (literally) in my yard the other day and was curious as to their age. My wife and I purchased an old house last fall and the garage (22x51) was obviously a working automobile service business at least back as far as 1923, maybe earlier. It's great seeing where past mechanics made notes on the old cabinet doors about which car needed what back into the 1930s. Thanks for the help. I'm planning on going to the historical society and seeing what I can learn once this virus thing is over.