This is a very good video which I enjoyed, however im not sure the 1933 UK penny is one of the most famous coins in the world. I think it is just too rare to be relevant to collectors and others interested in coins. The 1937 Australian penny is of similar rarity with I think only about 6 in existence, however it is not as famous as the 1930 Australian penny which I think is unarguably the most famous Australian coin, and of which there are estimated to be about 1500-3000 in existence. This means that a serious collector (who is prepared to spend $15,000 to $30,000 on a coin) can conceivably expect to be able to acquire a 1930 penny in his/her lifetime as they do come up for sale every year or two. There is no way anyone can expect to get a coin of which there are only 6 or 7, so for collectors it may as well not exist at all and therefore generates comparatively less interest.