Help in identifying these abn wings

[BILL THE PATCH]

Sorry for the lousy pics it's all I have right now. What I would like to know does anyone recognize the marking in the left hand corner. What maker? Could it be Japanese occupation era? Any help appreciated. here is a front picture

 

[triplecanopy]

It is hard to see with the angle, but it appears to be S21 which is a hallmark for Harry Sugerman or Susco.

[BILL THE PATCH]

Thanks

 

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