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Some jars have embossing that is unusually faint ( for instance, just one or two letters within a word) and this can sometimes be due to accumulated debris partially filling the engraving of the lettering on the mold itself at the time of making, or perhaps some other reason.
Later versions (after circa 1936) were made in clear glass, and some (usually from the 1950s) in brown amber.
The underline may be very long, or heavily “looped”.
See this chart (courtesy Minnetrista.net) showing logo variants at the following link.
In general, the Ball Perfect Mason variants are listed in the Red Book from #332 to #363-3, and several of the BPM error jars are found within this group, listed as jars #352 to #363.
There are no doubt very minor variants/errors that are not currently listed in that guide.
They are commonly seen for sale at antique malls, farm auctions, flea markets, yard sales, and on online auction sites.