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The wood has pores that are not common in maple but normal in ash, so my vote is that it really is ash. It looks like the black ash burl pictures found here:
http://www.hobbithouseinc.com/personal/woodpics/ash, black.htm
I will post this a day early.
There is a positive test:
Place the handle in the HT oven and ramp to 1000F . Hold for two hours.
Check results - it will almost surely be black ash.
Seriously, it looks like black ash burl. I used to use a lot of it but my source dried up.