Hiya Flick, it does look a lot like a flint W/F bark vase but there's something about the rim that doesn't look quite right to me - does it have a line around or is it an effect of the photograph. I ask because all of the W/F bark vases I've had have (quite a few in the past but no flint ones admittedly) don't have that 'line' around the rim. There's a kingfisher one in my shop at the moment - I've just tried to compare them. I'm probably wrong (I hope I am anyway) but none of mine have looked like yours appears to at the rim. <<<doom and gloom merchant - soz!
Can you take a photo from slightly above to get the rim in a different angle?