Found at civil war site

[civil_war22]

Can't figure out what this iron object is. It's about 3 to 4 inches long. Also can't figure out what this other circular object is. The back has tabs that holds in a smaller inner circle. Please help id thanks

 

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[civil_war22]

The circular thing says pat. something 13 and also reads I believe Carr east Boston company

 

[vhs07]

Could the round thing be part of an umbrella?

 

[NOLA_Ken]

The round one looks like a grommet, no idea on the other one

 

[civil_war22]

Do u think tent grommet. It's got the small inner ring like most tent grommets

 

[TheCannonballGuy]

Yes, the circular object is a grommet ...but it isn't a tent grommet. It is one of many vaieties of stud/socket/snap-fastener grommets. Based on its markings, yours is a Carr Patent fastener grommet, manufacture by the Carr Fastener Co. of Boston, sometime after the year 1913. Although the VAST majority of such fasteners were manufactured for use on Civilian items, some did get used on Military items. Therefore, I was able to find some relevant info for you at: U.S. Militaria Forum > WW1 mess gear marked R.I.A. 1916 ?

From that webpage:
"In researching the U.S. Patent Office online files it is possible to sometimes see the progression of mergers. For example Fred F. Carr has a number of patents for all kinds of mechanical fasteners including several stud and socket fasteners and owned the trademark "Lift-the-dot."

The 3-to-4-inch-long iron object resembles a linchpin. Unfortunately, its form is not distinctive enough to date it.