Coopers vintage drums has this to say about this strainer (see the quote below). I didn't include the photo Cooper is referring to in their statement but it was of the strainer as pictured on the drum here in the earlier post.

"By 1923, Ludwig was offering their “top of the line” snare drums with the strainer pictured below. During the 1920’s, this was known as the Professional Strainer and was used on their top models until around 1929. This strainer would later be known as the Pioneer strainer, being used on secondary models such as the Pioneer and the Universal snare drums."

Thanks guys for the very helpful info on this strainer,... hopefully I'll be able to come across one in the not so distant future and not break the bank on a it in the process??