I have found inconsistencies in Frontier’s numbering system before. I found a blade that belonged in a Gunpowder Black handle in a Sundown Yellow handle. This is not really that unusual.
I guess it stands to reason since they seem to have been made by at least three different companies. –
I have S-cards from Camillus that documents that they made some of them. I also have it on very good authority that Imperial made some in their Providence RI factory. I also have in my collection a Frontier that was made with the Swinden Key like the Old Timers. The only machines that could make knives with the Swinden system were at the Schrade factory in Ellenville.
So with three companies making them, someone is bound to mess up something!
Here is the 4625 as listed in the 1975 info sheets from Imperial Knife Co. Inc., Providence RI.
It clearly shows a drop point blade.
You will notice that the 4625 is listed from 1979-1983, yet the pic I just posted is from 1975.
Now we have to pause for a history lesson so this will make sense.
Imperial Knife Associated Companies (IKCO) consisted of Imperial, Schrade and Ulster Knife Co. This consortium was formed around the end of WWII, as I recall without looking it up. Albert Baer (the brother of Henry Baer –‘Uncle Henry’), purchased Ulster Knife Co in 1941. In 1963 Albert Baer bought out the last remaining of the stock in Camillus from the Kastor and Wallace families, after the death of Alfred Kastor. This made him the sole owner of Camillus Cutlery Co.
By now you are getting the idea that Albert Baer was a mover and shaker in the knife industry. About 1984, IKCO was reconsolidated to form Imperial Schrade Corp. I am unclear if Albert Baer was the sole owner of Imperial Schrade, or if this cleared the way for that to happen, but as I understand it he eventually was the sole owner of Camillus and Imperial Schrade, making him the most powerful man in the Cutlery Industry, worldwide.
OK, now back to these two different knives with the same model number.
I suspect that either the dates on the sheet is wrong and the knife is a mistake OR The pattern was changed later when Schrade started making the Frontier knives (and I do not know when that may have been, but I suspect it was in the late 1970s or early 1980s). Remember Imperial & Schrade were both part of IKCO before the Frontier line was ever introduced. The first knife in your picture looks like a Schrade 225 or an Old Timer 25OT. I imagine at the end of the model run they had run out of the drop point blade and finished some off with the secondary blade from the 25OT or the 225.
When the company was reorganized into Imperial Schrade Corp, it was decided that they would discontinue the Frontier line, as it was too much direct completion with the Old Timer brand.
There are a number of inconsistencies associated with these knives, I think it has to do with internal differences within IKCO and then Imperial Schrade Corp.
Much of this information comes from a Frontier collector who used to post here on AAPK as GreatScout.
I hope this makes sense.
Dale
This knife in question and most of my Schrades are GREAT hunting knives.I SCUN OUT A MOOSE WITH THIS PARTICULAR KNIFE,but for deer hunting I CARRY A Schrade 158ot and a 34ot all I need 
