I've read where Mr. Bakewell of the Bakewell-Pears of works in Pittsburg was attributed with development of a cheaper method to make red lead and Deming Jarves considered him to be the father of flint glass.
I don't have any early flint in the house in the house that I can remember. I do have a set of wines and waters that can be found in flint, same pattern and age even to look at them they nake you think of flint glass but they're not. If I can find a picture of a good example like a spill holder, I'll post.
Your bottles are simple scent/perfume. Neither would be considered flint. They could possibley be simple Contential cut glass and the clear even American, not all that unusual to see in cut for their size. I wouldn't hazard a date guess because there is such a range they could be from.