Looks like an inductor but a low value one. You can see the wire coil(?). Is there a screw adjuster in the centre of the cylinder? Is there a "H" printed on it to show its inductance or is there an "L" printed on the board, like the Rs and Cs? It looks like a small inductance which is odd, considering the surrounding components and their layout, which suggests lowish frequency of operation. It could be a transformer - how many connections are there? IS there a "T" on the board?
MATLAB's suggestion is also possible.
Does the board work? What does it do?
There are more questions than answers, I'm afraid but I hope they help.