Military button or Captain of a team?

[WHADIFIND]

Appears to be solid brass.

Was down about 6 inches.



It's been suggested that it might have to do with the Fire Dept.

 

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[Joe1944]

Reminds me of a WW1 collar disc, I have one with the same checkering and screw back, but it doesn't say CAPT. Never seen one like it. Cool!

 

[WHADIFIND]

Reminds me of a WW1 collar disc, I have one with the same checkering and screw back, but it doesn't say CAPT. Never seen one like it. Cool!

Yep, kind of what I'm thinking too. Don't worry about never seeing it before. Evidently, judging by the responses, (or lack thereof ), this even has the experts stumped. LOL

Maybe it's just a button off someone's jeans. LOL!

I dunno, but I'll keep looking. Thanks for trying!

 

[TheCannonballGuy]

US Military collar insignia discs have several identifying characteristics:
1- They show a soldier's branch of service or unit -- never his rank (such as Corporal or Captain or Major, etc)... but this disc says "CAPT".
2- Their diameter is specified to be exactly 1-inch... but this disc appears to be approximately 7/8-inch.
3- Their "background" is always dots arranged in diagonal rows, or cross-hatching, or plain -- but this disc's background looks like tiny wavelets or a cobblestoned street.
Dating Metallic Insignia: Collar Disks

So, this disc seems to not be a US Military collar-disc insignia.

It is known that the Police and Fire Department services have had collar-disc insignia. See some of the varieties at lower right on this webpage:
EMS Collar Insignia -

However, for many decades, Police and Fire Department rank insignia have tended to be the same as US Army rank insignia. (Chevrons for non-officers, and bars or an oak-leaf etc for officers.) Still, this disc might be an early-1900s Police or Fire Department rank insignia.

 

[Subterranean]

CBG offered great info. Other possibilities are private company riverboat/steamboat captain collar insignia, or Salvation Army Captain insignia. Cool find, congrats, Sub