Hi I am currently looking at buying a watch, original plan was a new watch (formula one auto) . However I have always loved the slr 300 But out of my price range. I have found a second hand one on watches.co.uk at a great price that I can afford. And looks to be in good condition. Only downside is it does not have a tag heuer original certificate. They claim they have checked it out and provide there own authenticity certificate. Is this good enough? I have researched the company and the seem to be trustworthy and have a good reputation. But I really don't want to waste my money.