There's also 3 variations of the mono/stereo Providence 7".
First, the push-out centre version, as shown in the discog:
As well as a solid-centre version like this copy currently on eBay:
And thirdly a jukebox centre version like the one I own. This one has half the label text chopped off by the centre hole.
The fact that there's 3 different pressings (combined with how frequently it appears on eBay) makes me seriously doubt the rumoured "500 copies".