My parents left me a mystery..

Can anyone help me to determine the age & style of my furniture? I've been researching for a year! Posted pics include; The hardware latch under the dining room table to add or take out the leaf, (you pull a medal cord to latch & unlatch under the table), corner of the table underneath, china cabinet, and a credenza of some type? A church gave the entire set to my parents in 1983. The credenza & china cabinet use a skelton key to lock every single door & drawer. The seat cushions are not original. I made them to match the skeleton keys used for the furniture.