hi, that's a nice honest AP by the OP.
Here is my take on it. After the 4100 came the 4486, which turned into the 14486, then 14700, followed by the 14790.
My guess is this is a late 4100 or 4486 (not 14790). Here is a pic of my 4486, which is less than 50 case numbers later than the OPs.
View attachment 757162
Click to expand...