wouldn't normally be here, except - from memory all of the wts. I have seen in charity shops and boot sales have flat bottoms, and as you can see, this one doesn't. I don't remotely collect wts. - too much other glass to lust after - but wud be very interested in whether this is unusual, or common. I thought it had a sort of wfrs. saphire look to the colour - although appreciate it is not really one of theirs. thanks for looking. Paul S.