Dennison issued at least two different packages of what they called String-Em-Outs. (Their marketing person at the time these were released, in the mid-1920s, was not a word wizard.) The cited value of $400 on page 250 resides almost entirely in the exceedingly rare and nicely illustrated envelope containing this mainly forgettable JOL banner.
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Mark B. Ledenbach's vintage Halloween collectibles blog.