Nice collection! I didn't see a Frontier version by Imperial. The Frontier line was discontinued after Albert Baer bought all the remaining stock in Imperial Knife company.
They made four versions that were direct competitors with the 8OT. The line was created to compete against the Old Timer brand.
That's why Albert discontinued them as soon as he had full control of the company. Some of the frontier knives were actually made in the Camillus factory and some work believe it or not, made in the Schrade factory.
If you don't have these four knives, you may want to look for them because they are the same frame as the 8OT. I've even interchanged back springs between these knives and 80T.
Fronter- Pwdhrn Stg 4431 Premium Stock, 4" w/clip, spey & sheepfoot blades
Fronter- Ol' Ivory 4432 Premium Stock, 4" w/clip, spey & sheepfoot blades
Fronter-Sundowner 4433 Premium Stock, 4" w/clip, spey & sheepfoot blades
Fronter-Gnpwd Blk 4434 Premium Stock, 4" w/clip, spey & sheepfoot blades
Impressive collection!
