Blackface Federal depression glassware set

Got these at an estate sale and was told they are valuable. Any more information would be greatly helpful! Approx 7" tall 2.5" diameter. Marking on the bottom looks like a backwards F in a shield shape. Age estimates?

7 glasses are by the same company and are:
One blackface heaven scene.
Two tribal dancers scene.
Two Spanish salsa dancers scene.
One Western scene.
And one rooster scene.