Imperial Prototype Info

[olddog99]

I Am Looking For Info On A Vintage Imperial Folding Single Blade Pocket Knife. It Has No Name But Has Three Patent Numbers That Pertain To Michael Mirando. The Patents Are For A New Handle Making Machine And Have Nothing To Do With The Knife Design Outside Of The Handles. Nor Could I Find This Knife Pattern In Any Of The Other Mirando Patents. This Knife Is 3 1/8" Closed With White Pearloid Handles. But What Is Different Is That The Blade Has A Hook At The Base Of The Blade And When You Close The Blade You Must Hold It Down With Your Thumb And Push It Back Toward The Base Which Locks The Blade Closed. It Will Not Stay Shut If Not Locked. It Has No Knotch In The Blade To Place Your Thumbnail To Open It And Will Not Open Unless The Blade Is Pushed Toward The Tip Of The Blade With The Thumb. This Will Release The Hook Locking Device Allowing The Blade To Open. Thanks For Any Info. Olddog99