It has a lot of the same characteristics of a Victorian Eastlake parlor table:

keyword used: eastlake antique solid parlor table marble top wheels

https://www.google.com/search?q=eastlake+antique+solid+parlor+table+marble+top+wheels

Are there any stamps under the top or inside the legs?

No unfortunately there were not any stamps.

There won't be any maker's mark. They are Eastlake style Walnut marble topped parlor tables. appear to be in very good condition. Dating between 1870 and about 1890.
Depending on size and condition of the marble and where you are worth anywhere form $150 for the smaller one to perhaps $450 for the larger one.
Again....things are only worth what someone is willing to pay.

Thank you Linda for your insight!

So I know this response may be a bit late but yes. I agree with previous comments that you possess nice East Lake Victorian tables. I wish you had taken pics of the tops as the condition of the marble along with the corner cut details can significantly add to the value. It is also important that the marble be as near white without stains as possible. Having said that I suspect value to be in the $200 each range. They are not especially rare but look in good condition. Too bad they are not identical as that would add to the value.

Good luck,

Kippy