If I'm picturing it right, the Soma Sparrow may be similar to what you're talking about. They describe it like this:
This a narrowish touring/townie bar. At 490mm, it is more agile for squeezing through traffic than other townie/MTB bars. Try it on a single-speed or fixie. Compatible with MTB grips and shifters. Designed to fit Soma reverse levers and bar end shifters, which is recommended since its narrowness prevents it from fitting side-by-side shifters and brake levers unless you trim the grips. Fits 3-speed Sturmey Archers great. Can be used flipped to be used as a riser bar or down for a less upright position.
25.4 center, 490 mm width, 50 mm drop/rise