I believe it's a neck humbucker because all the bridge HB1s I've pulled have had an extra tab for coil tapping or phase inversion or whatever that little switch on my S300 does.
I believe it's been recovered because I've never seen an HB1 without the double ridge cover like the ones in my pic below.
Like I said though, only Hans knows for sure. Maybe there was some limited time where they came with regular covers that I don't know about. Honestly, now that I think about it, I wonder if the bobbins would easily fit in another cover. I know the covers are wider... Are the bobbins? That makes me wonder if the pickup had an issue in the past and was rewound. Hmm...