Horace Partridge Baseball

[hcj812]

So I have a baseball, made by Horace Partridge Co. It's in an orange box with a blue seal. I've extensively researched, and I can't seem to find any information for this ball other than who it was made by and I've come to think it's from the 1920's-1930's. It says "Junior Major League", which is kind of confusing. The ball itself has red and navy blue stitching. It's 8 3/4", 4 3/4oz. I realize this isn't a standard size baseball...but with the research I've done, even little league balls are standard 9in 5oz balls... if anything they just weigh less but are still 9in. I know that even when the standard size of a major league ball was changing, it was never smaller than what it is now. If anyone has any information or could point me in a direction, that would be great. Thanks!