Beautiful chairs I've never seen before. Help!

I bought these as six-chair set with a matching oval dining table with two leaves. There are two captain chairs and four regular ones. I have searched and searched to find who made them or anything about them. They are beautiful and I feel like the clue is in the work in the top rail or the line that runs underneath the front of the seat. There is a matching line that runs down the legs of the table. Can anyone please help me to identify them? The stamp is on the bottom of the chairs. The table has most of the same letters, but they are hand written. THANK YOU!