Featured Estimate age?

Is it possible to estimate the age of a frame based on the construction? This houses a mirror, and measures 29 1/2 x 36 1/2 inches. The mirror has some minor silver loss, and the surface of the glass is slighty wavy. I'm not absolutely certain the mirror is original, although my mother told me years ago that she felt it was as old as the frame.
As you can see, the corners of the frame are dovetailed.
As with so many of my other pieces, this was inherited from my mother's family in Edgefield, SC.

 

These are good pics, but it would be good to have one of the whole front to see age of glass. Can’t tell from these whether glass replaced.

The construction and age of wood indicates 19th century, possibly very early 20th. It looks like it was always to hold a piece of mirror glass, and not recycled picture frame, because of shallow depth for insert.

The use of premade molding attached to front, and the large size, indicates latter part of 19th century and not before. Late Victorians were making relatively huge windows and mirrors, and 36” qualifies as huge.

BTW, there is writing on the back of the left and bottom frame pieces, what do these say?

 

Photos of the entire front of the frame and mirror, and of the writing on the left and bottom frame pieces. I'm not sure I can decipher them.

 

Unfortunately that is 20th century glass so either glass has been replaced (my guess, supported by finish nails used to hold glass) or glass and frame was made later in 20th century than I was guessing, after factories had improved production of large pieces of very flat glass. Front also shows decorative trim looks to be plaster on wood, appropriate for late 19th early 20th. Writing looks like stock numbers, either the manufacturer or dealer, so not typically useful, unfortunately.

 

It would not surprise me to learn that the glass has been replaced, but educate me about how to tell just by looking at a photo if the glass is 20th century? I'm curious.

 

When you’re looking at older glass, three things to consider: thickness, size and flatness. Don’t know thickness, but doesn’t matter. This is quite large and extremely flat (see dead-straight reflection of door frame) so must have been made into the 20th century.

 

Thank you for explaining. Makes sense!