It just means you have an older plane – sometime between when Union started in 1900 and when they were bought by Stanley in 1920. ( they were later bought by Miller Falls in 1957)
Frank Bailey filed for patents for an adjuster lever and for a left hand thread adjuster nut around 1888-1889 and assigned the patents to Stanley. Berfore that, even Stanley planes Had no lateral adjuster and the depth adjuster turned counter clockwise to lower the iron.
Union used a slightly different lateral adjuster but the left hand thread couldn’t be used until the Bailey patent ran out.
I have a type 7 number 4 Stanley (1893-98) , the first years they had both left hand thread on the depth adjuster and the improved lateral adjuster covered with three patents, a model all planes were eventually to follow.
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This reply was modified 4 years, 10 months ago by
Larry Geib.