At various times the Wagner Manufacturing Company used curved and straight logos, with or without the "Sidney, O" designation underneath. This kept the cookware from direct contact with the top of a wood stove. Note if there is a sharp ridge or a hollowed-out section where handles connect to the bodies of skillets.
All these things provide clues to the age of your cookware. "The Book of Griswold and Wagner" is favored by many collectors.
If you affluent enough to have indoor plumbing in 1920, you were most likely not a farmer.
Here are tips that may help you to hunt your treasure. It is important for you to know how old your collectibles are so that you know whether your collection is a true antique item or not.
In the late 19th century through early 20th century, there were many manufacturers of high quality cast iron cookware.
Cast iron was affordable, cooked really well, and is virtually indestructible if treated with common sense care.
At this point the sink is focused only on functionality: the high back prevents water from soaking the walls, the drainboard offers a place for dishes to be dried, the apron provides stability as well as a place to rest the lower body.
The aesthetics of the sink were not important because the kitchen was only seen by the lady of the house and (more so) her staff.