Duggap wrote:
> A navy button with an iron back would mean it's a fashion button from a blazer.
This is intended only a friendly educational correction. Duggap is "generally" correct... US Navy UNIFORM buttons never had an iron/steel back, because salty ocean air causes the back to rust, making a stain on the uniform. The exception to that rule is the "miniature" (cuff-size/kepi-size approximately 14mm) US Navy buttons which attached the leather chinstrap to the navy's version of kepi hat. A rust-stain wouldn't show on the black leather chinstrap. I believe Gregg3131 found an 1830s version US Navy kepi-chinstrap button.