Hi JBurton,
Yes, that appears about right from the parts on it. From what I can see, it appears to have a 4G control box which has better motor drivers and smoother operation than previous models and generations (4th Gen). You may find a date of manufacture on the control board inside the control box. Just remove the 2 screws on the ATX case and have a look. It will be a white printed Avery style label on the board itself.
So that you have an understanding of what a 4G PRT Benchtop looks like (what you have) in comparison to a 3rd Gen PRT, have a look at this thread
HERE. Note the gold utility strut instead of the aluminum extrusions + 4-roller Z axis compared to your 4G with 8 rollers.
Functionally speaking, the PRT (Personal Robotic Tool) Benchtop you have is very similar to the first generation PRS (Personal Robotic System) Buddy 32, first sold in 2008. The PRS is a 'system' because it includes a table or stand, whereas PRTs were sold with either the table or stand as an option...full size tools got from the X rails up & Benchtops without a stand, which is probably how yours was sold as it is missing a gusseted ShopBot blue lower frame...and there is no shame in that - it IS called a 'BenchTop' for a reason.
As far as selling it, you may want to consider giving the new customer some training on it to sweeten the deal. I've found when a customer is confident they can do it on their own and get their questions answered, everyone can sleep better after the deal is done.
Hope that helps...
-B