Harry, I emailed the seller before the auction closed and got the same photos, what in intrigued me was it being a double sided English language version as I've never known one to come up (there have been auctions for the Swedish one sheet that state it's double sided tho). She got back to me apologising saying it was only single sided and would amend the auction. Because of the extra Portuguese sticker I left it. I've always had a few of these in my 'watch list' on ebay but never jumped on one as I've not been totally sure which are legit.
From what I've seen it looks like there's several versions:
Japanese 'English language vers.' (20"x28") - the ebay auction doesn't state double or single sided
Swedish 'Otroligt men sant?' vers. (27"x40") - with round soundtrack graphic - the auction states it being double sided
Italian 'Credete all 'incredibile' vers. (2 sheet) - with white borders on all sides - the ebay auction doesn't state double or single sided
Polish 'Czym Jest' vers. (27"x39") - no faces at all
- the auction states it being single sided
As for a Spanish version I'm confused, an ebay auction saying it was a Spanish version had the same strapline as the Swedish version, plus on
www.themoviepostershop.com (reprint central) they say they have a Spanish version reprint but it also has the same Swedish text 'Otroligt men sant?'. I'm yet to see a Spanish language version, if you've got a photo I'd love to see it.
On the US or international (obviously English language) version front I've only seen a few auctions. The aforementioned one that has the additional Portuguese sticker and the one Holiday mentioned that he's not entirely convinced about (with very poor photo on the auction). As Holiday's got one they do exist. And thinking along those lines the Portuguese version you just won on ebay could well be an international one sheet that they sent to other countries rather than designing and printing a whole new batch of different language versions.
Even the UK quad throws up some questions as I don't understood the massive range in prices they go for. I know there's reprints but some cosher looking auctions from good sellers have them for £35-$100 odd and then there's some that are asking 100's of dollars (seem to remember a couple for around $450!). The same with dealers websites, although Quadbod have one for a reasonable £65.
I don't think that helps at all but thought I'd chip in
I might go for Loce's auction at some time to see what turns up, will let you know if I find out anything.
[Edit: cool, just had a quick butchers at yours Holiday, nope, never seen that one available at all! Great poster... does throw up the conundrum about whether there's a legit full size English language one sheet with credits tho.]