Sadly, it isn't rare, so I hope you weren't pinning your hopes on making a lot of money...!
It's the Model T Ford from Tintin in the Congo, issued as number 3 in a series of seventy 1:43 scale Tintin-themed cars by the firm Axis. They have been reissued in a red box, but that doesn't seem to affect the price much.
As well as being found in shops, they were also sold (in the blue box) through a week-by-week magazine series, and I think the Model T was available as a promotion with that, which might explain why so many seem to be available second-hand.
Looking for a quick guide just now, I saw there are quite a few available on eBay, and searching on ones which had sold, the going rate seems to be somewhere between £8 and £12, give or take - you might get a little more if the box was perfect, you might get a little less if the condition wasn't quite so good.
Hope this helps! | 
