Can You ID the Maker of this Old Leverlock?

[Gumshoe]

I bought this knife in a thrift shop in Los Angeles in the early 1970's. It is 4 inches closed with genuine stag handles, steel liners and nickel silver fluted bolsters. The blade appears to be a clip blade with a nail nick - well worn or intensionally ground to a point - it does have a sharp edge. It is very well made.

The maker's mark and/or a pattern number are long gone. My guess is that it was made prior to WWII. It is very similar in appearance to the old H. Boker brand, except for the protruding leverlock mechanism.

Any help would be greatly appreciated. Gumshoe

[TwoFlowersLuggage]

Look at the protruding blade stop in these two videos of Ka-Bar levelocks:

https://www.youtube.com/watch?v=zfNtS4a-avg
https://www.youtube.com/watch?v=a6dd66eXQPU

To me, that feature look similar to yours - but I really know very little about such things.

[eddymunster]

Friedrich Wilhelm Engels? Not much left of the blade. Very neat.