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It's a pouring assist handle. Some DOs, like BSR's, also have a pour spout opposite it.
Yep, I have to agree with Doug. I had one just like it, glass lid though. Best I could identify was a with was a Wagner. Lack of grooves on the ears and the tab on the bail. Got $12 on eBay for it.
The grooved tops of the bail attachments allow the wire handle to rest completely flat, instead of otherwise slightly propped up. The bail tab referred to is that bend on the one end of the handle that serves as a stop in the vertical position, also to assist pouring. Sometimes it's these small details that help point to who made what, or when.