Looks like a 1uF +\- 20% capacitor to me, AC line buffer, ballast capactior, or motor starting application. Not sure about all the markings though, I would like an explanation from someone else that knows what the 47kΩ marking means.
Nigel Goodwin, I think that's it. 'Malha RC' means 'RC Network'.
I think it was supposed to be used in a telecommunication related electrical installation. I can't confirm because a friend 'found' it in the place a few months ago and only brought it to me now.