Metal Officer rank construction WWII-Vietnam what is the material construction terms

[phillock]

Hi Team

 

I have these 3 officer Ranks from WWII to Vietnam period.

 

My questions is what would the materiel and construction method they were made from to describe the metal ranks.

 

I would like to add more than just metal ranks in my database, if that makes sense.

 

O2 LT 1K KREW 50's-60's

O3-Captain WWII GEMSCO N.Y.

O5 Major NS Meyer INC New York raised 9 M in shield 1950's

 

cheers

 

Phill

[patches]

Non Precious Metals right.