Good eye Rolo. I noticed that too and I am unsure what the deal is. In all of the other pictures and advertisements for the Dynascope Deluxe 8 I have not seen another mount with an RA assembly box on the DEC. It has all same holes too. I think it came like this from the factory. The RA is on the left and DEC on the right.
I also noticed something else while looking at pictures and advertisements for Dynascope Deluxe 8 mounts. For the 6" and 8" deluxe the equatorial heads are made of cast aluminium and like the one in your picture is one sided. Where as mine is made of cast iron and is double sided (see picture below). Here is a Criterion catalog featuring the Dynascope Deluxe: https://wiki.telesco..._Literature.pdf
My DEC assembly is also missing its setting circles pointer and it does not look like one was ever installed. I am a bit miffed about that. I will have to figure something out to replace it and possibly the RA pointer as well so they are matching.
I am starting to think that the maybe Criterion ran out of some of the normal parts when this scope was ordered and they just threw on some stuff that they had.
I hope some other Dynascope Deluxe owners would chime in with how their mounts are assembled.
With a small company in a cottage industry like Criterion, it's quite possible they used what they had on-hand. I'm sure Cave did that as well. If I ran one of those businesses, I would to.
That said, if there is a motor in the declination housing, my first thought would be someone wanted a motorized Dec drive. But then, there is no control box.