Nice, but unremarkable pieces, in what appears to be good to excellent condition.

Marble-topped one is Eastlake style, the round pins were a fad in furniture making briefly. It looks like walnut.

Chest with mirror is early 1900s, with Eastlake-ish influence. Using that bullseye ornament died out around WWI, which puts a limit on how new it is.

$20 chest ... ??? May be a rural production, hadr to date. Excellent bargain for $20!

Chair - nice so-called "windsor. These are hard to date because they have been in continous production since the 1700s. The laminated seat (made of many boards instead of just one slab) indicates it is not one of the really early ones.

Well the top chest is a Victorian, I can't see the kind of dove tails on the side of the drawer....too dark, but I suspect they are maching made. Puts it late 19th century. Again can't tell what kind of wood...but it might be cherry, maybe maple, possibly walnut ...with a burl veneer trim and a rose marble top. Value? Depends on where you are...maybe $400?
The next one with the mirror looks like a married piece to me...the top part with the morror has been recently introduced to the bottom...likely that's why it was refinished.
see those light marke on the back? I think a different mirror was attached there. What do the screws look like? New and shiny? The dresser is very nice about the same age as the other one ( would love to see the dove tailing on the drawers) looks to be maple, with nice key hole trim that looks to be in good shape. But I don't think the mirror goes on that dresser. Worth about what you paid...I don't think you will hurt any value by refinishing....as the value has already been compromised by the "marriage" and the new coat of whatever over all.
The $20 dresser is your best buy!...Nice old pine chest...probably solid sides rather than paneled, bracket feet. The dovetailing appears to be hand done and very skillfully hand done, bracket feet. Would like to see the sides, the back and the top before I put money on it, but it looks like perhaps early 19th century. You need to get 2 knobs to replace the missing ones made....don't change to more modern ones.
The chair is just a not very old chair....Windsor styled...well made, looks good with your stuff.....but not an antique.
Ya done good at that sale!
Linda C

This is so exciting to learn about my furniture....Thank You!
I took additional pic's today and looked at the things suggested...plan to post them later tonight when I have a bit more time...please come back to see if they are helpful in answering the questions!

Here's the pic's I took today...

LindaC-You mentioned dove tailing, but I wasn't sure which piece you meant, so I took pic's of both.
This is the marble top chest...side of drawer
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This is the chest with the mirror...the back. Does the hardware give any clues as to age, or whether the mirror is original? I do see the difference in the wood color...now that you point it out! Still very curious about the stickers on the back...any ideas?
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Hinge that allows the mirror to swivel
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This is a top view of the drawers on chest with mirror
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Side view of drawer (Mirror Chest)
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The Pine Chest...This is my all time favorite bargain! I love this chest, even with all its stains and imperfections. Linda-you wanted to see the sides, back and top...
This is the right side...in looking more closely, I think you are correct that it's one piece. The "line" that you see is actually a crack...there's one on the other side, also. However, if you run your hand along the top of the side, it's smooth-no seams. Is that what you meant by "solid"?
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This is the left side...the crack is more pronounced.

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The crack on the left side actually goes into the top somewhat. See how it's sort of a diagonal crack? If that was a paneled side, it would be straight, right?

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The top pine chest...hard to get a nice clear picture of whole top...
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And the back
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Definitely curious about the dark color.

Linda-you also suggested having new knobs made. Who does that...what would I look up? By the way, I wouldn't change the knobs...I love them.
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Can I add something new? As I was taking these pic's, remembered another bargain chair...about $10 in a resale shop. My first chair had a laminated seat, but I'm not sure about this one...could be just one piece. Need trained eyes to check it out.
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The bottom
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The chest with the marble top dates as lazy and I thought..about 1890 to 1910...those dovetails are early machine made.
The mirror chest it oak. Those screws look new to me. And the drawer shows no dovetailing, which likely ( note I didn't say always) means cheaply factory made. I am guessing 1930's for the top and 1890's to 1910 for the bottom...based largely on the brasses, but they could have been replaced.
That pine chest is wonderful!...Solid panel sides and top....made from one big board from one huge tree!!! The boards cracked because it wasn't constructed with panels as the marble topped one was and when glued in place and over the years the boards shrank....and there was nothing to do but split.
Notice the srtaight saw lines on the back? Not from a circular saw....but from a hand operated pit saw.
I suspect the whole piece was that same dark color originally....notice the drip line on the right side of the back? Indicating that it had been sat on it's side and stripper applied to clean that black off.
You can find new knobs like that.....keep looking, but meanwhile just buy any old wooden knobs and stain to match as closely as you can.
And the chair....nice old "farmhouse Windsor". Plank seat, shaped, lovely cant to the rear legs ( just try to tilt on that chair!) Probably at one time was painted black and had decoration, stencilling on the back splat and on the edge of the seat and perhaps stripes in the grooves on the legs. Probably dates to 1880 or so...likely poplar or maple.
Linda C

Check out VanDykes Restorers for Eastlake type knobs, etc.

Here is a link that might be useful: Van Dykes

Second Windsor chair is the oldest with plank seat and lots of wear on the foot spline. I see owner/maker Wm: William someone, Phila(delphia) Pa. on the label of the chest, no? All are charming pieces from late ninteenth century and bargains in my opinion.