Agree....date anywhere from 1930 to 1980. Sort of "Sharaton-ish" style....commonly called "traditional". Nice chairs, likely not mahogany aas they appear light where the stain has worn. That webbing is typical for that sort of slip seated chair. Appears last redone before big staple guns became common.

They look like mahogany to me, but it's hard to identify wood from a pic like that. The darker bits look like grunge/patina. Mahogany can be quite light, but it's often stained darker. It has a every fine grain.

These chairs are solid mahogany except for the center back, which is a plywood veneer. The center cut outs vary. I believe the style of these chairs are referred to as a Sheraton Chair. These were mass produced in the late 1800's - early 1900's and vary in quality.

It is a Lyre back dining side chair, probably mahogany. It is used with Duncan Phyfe style dining table. It isn't an original (early 1800's) around 1930/40's. How about black?

Here is Duncan, himself.

I can see why it'd be called Lyre back.

I agree with early to mid 20th century. Definitely not later than that.

It's easy to see why @linda campbell think the chair might be Sheraton. Sheraton has a square or rectangular back and a slightly more decorative leg.

I certainly didn't think they were Sheraton....but definitly showed Sheraton influence