Leroy Remer told me that there were very few 112s made with the four pin configuration.
I forget the number he mentioned, but I'm pretty sure it was less than 300 of the 112s.
He also said there wasn't that many 110 4 pins, but that there were quite a few more made than the 112s...again, I don't remember the specific number he mentioned.
I believe Bert is right on the mark from what I know of these.
Below is my collection of that variation in 110s and 112s.
Here are my 110s in all conditions from very poor to NIB.
Here are the very rare 112s also in all conditions from very poor to NIB.
Also, George Stenzel, whom I consider the most knowledgeable person on vintage 110s, told me that he specifically remembers them coming to market in 1976 for a very short period. He thought they were fakes, but found out they were legit.