Valuable means different things..
I think those marbles are beautiful and historical. Love the green ones. As to how much they're worth that's up to you. Yesterday and today I drove out from Trona,Ca in the Mojave Desert to remote Boroslavy Canyon to work a dump that'd been shut down in 1954. . An hour's digging in 121F heat yesterday gained me one marble. Another hour's digging today got me another marble. I think both are Akro Agate circa 1930s/40s. Now,if I showed those two marbles to someone who then offered me fifty cents for them I'd reply "Well,if they're not worth anything then go dig them up yourself you lowlife pile of crapola". That's the attitude you've gotta have as regards other people telling you what the goodies you've dug up are worth.
