Starting in 1906, Perfection switched from the "Wickless" style stoves to the current wick style. The wick for the first stoves was the #21.
Essentially the same style as we use today. The #21 was used thru at least 1922.
Then in <add Date> the #21 was updated to the #331. <Unknown what the differences are>.
Same packaging, different label.
Then in <add Date> the packaging changed to the more modern paper box.
This case is dated between 1925 - 1937.
Then in 1937, the "Inner Flow" 3 layer design was developed and the model designation was changed to the current 331-X.
The in <add Date>, a new box design, same wick.
A 1945 ad for the 331-X Wick
Then in 1955, with the company's purchase by the Hupp Corporation, the modern orange box was issued, with the same wick.
Finally in <add Date> Elmer Swartz purchased the cook stove section of Perfection and issued the same wick, made on the original Perfection machinery, with the original Hupp orange box, just dropping the Perfection name.
Note: PM me with any corrections or dates to finish this history off.