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Starting in 1906, Perfection switched from the "Wickless" style stoves to the current wick style. The wick for the first stoves was the #21.
[21-1_zpsua3gworr]  [21-2_zpsumbj5gyy]  [21-3_zpsbytuuzys]  [21-4_zpskcbgetsq] 
Above images are of a wick manufactured post-1917.

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>.
[331-1_zpsgdrtztiq]  [331-2_zpsiyojn4hj] 
Above images are of a wick manufactured post-1917.

[331-3_zpsd0jdlbkp] 

Above image is of a wick manufactured post-1925.
Same packaging, different label.

Then in <add Date> the packaging changed to the more modern paper box.
[331-3_zps2wwykx1y]  [331-4_zpso0byn7bq] 
Above images are of a wick manufactured post-1925.

[331_Wick_Case-Of_zpsxch2dbyb]  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.
[Inner-Flow-Wick_zpselakjaup] 
[331-X-1_zpssfajuohg]  [331-X-2_zpsxdawxbhl]  [331-X-3_zpsravmvkne]  [331-X-4_zpsruh4dseg]  [331-X-5_zpseyq8vl31] 
The in <add Date>, a new box design, same wick.
[331-X-6_zpscfpl4byt]  [331-X-7_zpss0arwoor]

A 1945 ad for the 331-X Wick
[331-X-Ad-1945_zpsefffhi8i]   

Then in 1955, with the company's merger with the Hupp Corporation, the modern orange box was issued, with the same wick.
[331-X-8_zpsrthtfn9b]  [331-X-9_zpsly7labpj]  [331-X-10_zpsscdpbwqf]  [331-X-11_zpsuavxqmfj] 

Finally in 1978 Elmer Schwartz purchased the original wick making equipment from White Consolidated Industries and began production of the same wick, with the original Hupp orange box, just dropping the Perfection name to both North and South America.

[331-X-12_zps3dfgqon0] 

Note: PM me with any corrections or dates to finish this history off.

So just what is the difference between the 331 and the 331-X?
I collected a selection of 331 wicks from the 1920's to present production and compared thickness and overall height.
[bpGkxjh] 
From Left to Right we have a 331 wick in the original round box, circa post 1924, because the box mentions Superfex burners. Another 331 wick, post 1924, in the triangle logo box. 331-x wick, post 1937. A Hupp era 331-x wick, post 1955 and a current production Schwartz 331-X wick.

[JBwI8VR] 
Dimensions are as follows: 331 wicks average 0.12" thick and 3.380" tall. The 331-x "Inner-Flow" wicks measure 0.135" thick and wick #3 (L to R) is 3.430" tall, wick #4 is 3.495" tall and wick #6 is 3.550" tall.
What I see here is the 1937 Inner-Flow wicks are 0.015" thicker to accommodate the 3rd ply in the center and they are slightly taller with current production being the tallest.
[nNEDF2Y] 
Below is the thickness difference between a 331 and an 331-x.
[VeUUw8Y] 
Finally note the Hupp era Perfection wick (#5) it is a 331-x but does not have the "Inner-Flow" designation stamped on the wick.
For those that are interested, I have included the 1937 patent for the "Inner-Flow" wick that Perfection purchased from the William E. Hooper and Sons Millwright company, Baltimore, Md.
. [Dk5MwY8] 
[KBH0zhj] 
[I2MzXS4] 


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TechEditor

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Reply with quote  #2 
Added detailed measurements of the 331 vs the 331-x wicks showing thickness and overall height.
I have also included the original 1937 wick patent.

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