Good news! I worked on the "black and yellow" knife a bit where the stamp should be and lo and behold I can now see the stamp! Something I hadn't thought of -- I also had to close the blade to a 45 degree angle to be able to see the full stamp since you can't see it when it's fully opened.
Anyway, it says "Imperial" on one line and then "Providence R.I." on the next line. I did some searching and found this forum (see the photo of different stamps) that confirms this knife was produced between 1930 and 1936. That's pretty exciting to me -- just to know that my granddad carried it around for a long, long time.
Here's a photo of it:
Anyway, it says "Imperial" on one line and then "Providence R.I." on the next line. I did some searching and found this forum (see the photo of different stamps) that confirms this knife was produced between 1930 and 1936. That's pretty exciting to me -- just to know that my granddad carried it around for a long, long time.
Here's a photo of it:

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