Succot trivia

Many Jewish / Israeli coins over the last two millenium have commemorated the festival, including the modern 5 agorot coin. Some of these coins, from the time of the Bar Kochba revolt, clearly show the 4 minim. What's interesting is that in coins #79, 94, 109, 123 (the same coin from different years) you can see a lulav, an etrog -- and just one hadass and arava, which is consistent with Rabbi Akiva's position in the Gemara.