I'm thinking 30s to 40s maybe even 50s , The ink looks like it might be moldblown,but cant quite tell. I love it when the flashlight shines off on glass as you scan a basement or crawlspace !!
House we grew up in was built ib 1876 and we havent went down there in 20yrs going to start. When I was a kid found mason jars full of marbles and silverwear.