I agree that the bracelet looks a bit odd. This case style was mainly kitted out with a Unisonic movement - obviously it's possible that the resemblance is superficial and that the case/lug sizes are different but I doubt it. I have the Unisonic and the lugs are 18mm and the bracelet (which came off a different Unisonic but with the same case) fits perfectly - perhaps with the caveat that it doesn't perfectly follow the angular shape of the lugs.
http://forum.tz-uk.com/showthread.php?161319-Universal-Geneve-grey-dialled-hummer-back-from-the-spa
And this is where the bracelet came from.
http://forum.tz-uk.com/showthread.php?138692-Universal-Gen%E8ve-Unisonic-work-in-progress
Based on this advert that I've seen for sale on Ebay (I must get a copy one day) I believe it to be the correct bracelet for the case.
http://www.ebay.co.uk/itm/1969-Unis...268?pt=LH_DefaultDomain_0&hash=item5651f4bd94Purchases made through these links may earn this site a commission from the eBay Partner Network
Judging by the number of 17mm NOS OEM straps on Ebay UG clearly made lots of watches with 17mm lugs and possibly either your bracelet or endpieces were originally destined for one of those - or they've been filed down for some inexplicable reason?
Good luck with sourcing replacement endpieces as you'll need it- there seems to have been a bit of a feeding frenzy with UG bracelets of late but that's probably more the case with the 19/20mm lug ones. I see that there's a Melbourne-based Ebay seller that seems to have a stock of UG bracelets but I can't see that he has what you need.
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