Frame, buckle, mystery oval, hot rock... more...

[Bucket Lister]

ITEM TID DEPTH F/NF METAL (Sorry about formatting--did this in a rush)

1. Cast frame segment 54/57 5" NF Bronze?
2. Cable clip 54/57 3" F Steel
3. Steel shard/stake point 87/89 4" F Steel
4. Sheet metal oval ? 91 6" NF (Zn, Cu, Sn?) Either Cu plated over Sn or Tn, or same plated over Cu.
5. "Hot Rock" -- GRAPHITE NA 4" F Fe
6. Steel buckle 86 8" F Steel
7. Collar/ring
8. 1" x 2½" steel pipe

I could use some help identifying items 1, 4, & 7. Item 4 seems to be Cu plated over something, or something plated over Cu.

 

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[ModernMiner]

Is #4 some sort of buckle?
MM

 

[Bucket Lister]

Is #4 some fort of buckle?
MM

IDTS. Too thin. First view has a couple of bent-over attachments that look like nails but aren't.

Second view: The double-strap attachment is bent all the way around. Looks like it originally attached to rivets on the right side.

I'm hesitant to bend it back into shape lest I break it.