The Singer will definately have a serial number, on the bed of the machine down from the brass "Singer" plate on the post. I think I see one in the same place on the Western Electric.
The Western Electric was made by National Sewing Machine Company, most likely sometime in the 20's or 30's.
The Singer is a 28 or 128...the serial number will let us date it for you. It has La Vencedora decals...the bar that's on the bed is to run the machine...it inserts in that hole in the front of the case....
Is it a value you're looking for?