It looks like it's military. I have a few panels that came with this and gauges (not if it's a b-16)
The shape makes it clear that this is from a single seater or tandem aircraft. This makes a glider very likely, which is supported by the "Vario" engraving over the column of small holes on the bottom right.
A little googling then brings me to this page and the assumption that this panel is from a Schempp-Hirth Standard Cirrus, Serial No. 176. The plane was badly damaged at Minisink, NY on October 23, 1976 in a botched landing and consequently written off. At that time it was registered as N11JY.
Schempp-Hirth Standard Cirrus (picture source)
Standard Cirrus instrument panel (picture source)