M.F. Christensen made marbles from early 1900's to 1917 or 18
Christensen made marbles from around the 1920's to around 1933 or so.
Peltiers shown here are probably late 1920's thru late 30's.
Akros probly would date about the same as Peltier. Akro took over from M.F. Christensen. At first they even sols some of M.F. Christensens old Stock in the 1918 to early 20's before they did there own handgathereds.