Uncatalogued Exhibits on eBay
 

This seller is selling some unique 4 in 1 exhibit cards.

Browns
A's

Uncatalogued 4 in 1s? The wide borders gave me pause...

Then I saw this one:
Cardinals

4-on-1 Exhibits by Jim Rowe, 1977
 

These are nice Jim Rowe 4-on-1's produced in the late 1970's by longtime baseball hobbyist-historian Jim Rowe of Berwyn, Illinois. Jim had thousands of original and copy negatives from which he created postcard, 5x7 and 8x10 prints for decades - supplying ballplayers, fans and hobbyists alike.

Rowe/Brace
 

Matt,

I have several of these. I used to order hundreds of PC-sized prints from Rowe/Brace during the 80's and 90's to use to send to retired players thru the mail for autographs. When they would arrive they would be neatly sandwiched between two of these 4in1 mock exhibits.

Name from long ago!
 

Thanks to you both for posting and identifying this! I remember his work well.
Take care,
Bill