IBM 5100 to 5110 Transitional Model

[Wayne Smith]

Has anyone noted this listing of what the seller is calling an "IBM
5100" on Ebay?  

https://www.ebay.com/itm/IBM-5100-B1-Basic-Language-16k-Memory-Powers-
on-monitor-works-but-no-text/112776476816

While it is listed as a 5100, it lacks the 5100 badging on the front
center panel (to the right of the power switch).  In addition, the
indicia on the bottom
(https://i.ebayimg.com/images/g/9VYAAOSwaC9aapB-/s-l1600.jpg)
indicates both models 5100 and 5110, and the KVA is listed at 0.4
whereas 5100s are 0.336.  Compare the typical indicia on the bottom:
https://tinyurl.com/ybmvms7u. 

The serial number is in the 5100 format of 10-1XXXX, but this unit has
the highest serial number I have seen on a 5100 (10-15687). 


I am guessing that this is some sort of transitional version or
perhaps a 5110 "prototype".

Any thoughts?

-W