Stripped these bars off a salvage bike. They're half-bullhorn and half-butterfly. 25.4 clamp area and a very thin grip area (haven't gotten out the calipers, but less than 22.2). Inside the curve is 22.2; standard mountain bike brakes and shifters were fitted. They came off an older Haro Vector.

Anyone recognize the bar? Google hasn't been helpful, though I do see images of Haro Vectors with similar (not exact) bars.

Is this a weird bar Haro put on some of its bikes, or a chopped up butterfly bar, or ???

It appears to be a knock-off of the Scott AT-3 bar, circa early 1990's. The Scott bars are super thin aluminum, yours appears to be chrome steel. I don't know about the Vector model, or what year yours is/was, but Haro MTB's could always be counted on to be a little 'different'.

A lightweight altertnative to MTB straight bar + bar ends, the hard-anodized AT-3 was lighter than a lot of straight bars. It and the AT-4, which brought the open ends together and forward like the 'aero' position of a TT setup, are the ancestors of the Trekking style bars of today.

You don't see bars like these fitted often as OE, cause they're a pain. It takes a long time to wrestle a pair of standard MTB grips around the corners, and they're not compatible with 'Grip-Shift' twist shifters.

https://sheldonbrown.com/scott.html

Thanks.
Not sure of the year - either 1994 or 1996, Vector V3a. Just a cheap steel MTB.
Yes, the bars are steel.
They had a few layers of bar tape on them. I assume the silicon-like tape and the 2nd layer were OEM, with the 3rd layer used for repair. Had to cut it off the remove the shifters and brakes, and remove the bar from the stem. As thin as the grip area is, it should be easy to get grips on the ends (making them stay is another story). If I can't slip a grip past the curve to put nearer the shifter and brake, I'll just use bar tape.