My plane has some patent dates stamped onto the lateral adjuster and a date on the iron itself. Do those patent dates actually have relation to the plane itself, or just was the patent was received?
Patent dates usually stayed on for ~15 years if my memory is working.
If the patent date came with the plane, as in the date on the iron, it indicates the plane was made that year or later. The '92 patent date wasn't used after a new Stanley logo came out in ~1907. The patent dates on the lateral lever had various combinations. A single patent date was on the lateral lever in 1899.
If there are three patent dates on the lateral lever and a '92 patent on the blade and these are original parts, your plane was likely made between 1893 and 1899.
If there are only two patent dates on the lateral, then the blade is likely a replacement and your plane dates a bit earlier.
jtk
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