Yes, pretty sure. These items have been handled by lots Archaeologists and included in a couple of research pools.
This picture is the dorsal side with a decent amount of flaking, and maybe the remnants of a previous overshot. The proximal/platform end is up top. The distal side is damaged, it probably fractured like yours do:
This is the ventral side.
Here are a couple of people looking at the group. (Dennis Stanford's Obit was posted a couple of days ago, a great guy.) This piece was in that group, I think it was likely the one I have circled towards the bottom of the pic. I have most of the Overshots in that part of the frame.