"John, great info, thank you. I have found similar information in my research as well. Two things: you are correct that the whittling modifications wiped out the etchings so now I am really focused on the tang stamp of the penknife.…"
"Paul, Schrade Walden trademarked the name Razor Blade Stainless 1964-1965- Schrade showed these in their 1964 catalog I'm told, with a stamp across the pictures stating - Not available until 1965. Schrade probably made these knives for…"
"John, I agree on your assessment of the main tang stamp. It's obvious that the listing of stamps we are using is not exhaustive. I'll be on the lookout for patent number examples and let you know if I find one. In the…"
"Paul, one more thing. Although your tang stamp most closely resembles a 1946-1956 stamp, it isn't an exact match. Don't rule out the possibility that yours may be earlier. Most note worthy difference is the lack of the crown above the…"
"Paul, although your knife doesn't have the patent numbers-- If we can find an example with the numbers, a Google search can at least tell us when the patent was applied for-- I already found many Imperial patent links, just didn't…"
"John, That's a great trick - thanks! I'm trying my best to nail down the date of manufacturer as close as I can. Here is an interesting clue: for some time period unknown to me, they stamped "Patent Pending in USA and Foreign…"
"Paul, the catalog page in your link is from 1974-- If you save the image from the original link you posted, it shows the date in the jpeg info. However, this style knife was made both earlier and later than 1974."
Paul, happy to accept your friend request-- Unfortunately, I do not have any more catalogues other than the ones I already posted. However, I do research knives here at IKC, and am working to see if I can dig up some more info for you.