Gene, Going by the pictures I would only estimate the age of this dagger to be first quarter 20th century at best and more likely the second quarter. I will know more when it arrives. What still looks odd in the pictures is that if the hilt is off-set it looks like it was designed to be held with the pointed side of the guard pointing down or out (fingers side) and the shorter side (thumb side) pointing up or in. Most daggers with straight guards that I've seen seem to be designed to be griped ether way.
Dimasalang, Thank you very much for your kind words. If this had not been pointed out to me by another member of this forum I might have overlooked it myself.
There are still probably quite a few of these out there so you should be able to find one. Good luck in the hunt and when you do find one please post pictures.
Thank you both again for you interest.
Robert