Duncan Phyfe Coffee Table & "Dumbwaiter" Table

Found these at a thrift store Saturday. They are in great condition, no cracks, chips, etc. The only problem is the water stains on tops. They have brass claw caps on the feet. The patina is so dark I thought it was wood at first. Constructed with old flathead screws. Not sure of the wood, heavy. Wondering what the age, value is. Thanks in advance for any info.