Old Dinning room chair with stamp 16C

I’m cleaning out my attic of items from my late wife. She collected these chairs and I just can’t remember where they came from or how old they are. They have a removable spring cushion and are fairly simple design. The only markings I can find on all four of them is a stamp of 16 then a C. I don’t want to give them away if they are truly really old antique.

Here are a few pics.Attachment 11738 Attachment 11739 Attachment 11740 Attachment 11741

I appreciate any help or knowledge given.

Tom