Yep, a riggers axe / California framer handle.Can we see a picture of the eye?
A lot of these will take a rigger's axe handle. I've been finding some really good ones at Do-It-Center. They have DIC labels but they're made by somebody else - I suspect at Vaughan & Bushnell's Arkansas plant because they look like Vaughan handles to me.
Other than that you can find pretty much any handle you need at House Handle's online store.