a_bluescat, ISMACS has an entry under Class 31 Singer for your table. Its listed as Singer Table # 5231
Also there is one on fleabay titled "1928 Singer Model 31 Tailor Sewing Machine ....". He lists the dimensions
as:38" x 19" folded down, 47-1/2 x 25" both sides up.
These dimensions match a table I have but I am missing the left leaf.
Lee Copp has some pictures of a restored one with coffin top here:
https://sites.google.com/site/oldiro...k33-industrial
The rear leaf has a complex hinge system that lets the leaf slide sideways to line up
with the left leaf when both are up. SteveH has a good picture of it in his thread.