Yellow ware Large 12" mixing bowl Stamp on bottom? Date?

I have a yellow ware mixing bowl large 12" diameter and 6" tall, it has 2 blue accent bands and those bands have two smaller white bands above and below the larger blue bands. The rim is rounded not flat. There are two small chips on rim. It has a marking/stamp on the bottom (which I understand is rarer to find a marking), the marking/stamp/hallmark looks like 2 vertical lines with with horizontal line over the top of those. Can anyone tell me who made this from the stamp on the bottom? and can anyone tell me the approximate year it would have been made. I'd also love to know if it has solid value but understand if you can't estimate the value.

 

I can't offer much help, but the mark on the bottom is "11" - the inside diameter of the bowl. I think it dates to the 1930s-40s. Condition will affect value.

 

This worthpoint listing cites a reference to Brush-McCoy, but I don't have that book: https://www.worthpoint.com/worthopedia/brush-mccoy-pottery-yellowware-1719991706

 

Thank you both, I am happy with the information you provided and to understand the mark under it, the age and the manufacturer.

 

The example cited on Worthpoint website sold for $25.00 in 2015 in case you are interested.

 

I'd say it's about the same value now.

 

stoneware dough bowls still made and in everyday use.