The 1915 20 centavos has 4 different variations. High relief – fine and course reeding. Low relief - fine and course reeding. I have studied a lot of photos of these coins, and have determined that this coin is course reeding (114 reeds), But I don’t have a clue how to tell high or low relief. Any help would be appreciated.
I have the same issue with a 1915 Peso. I've researched it and studied photos until I'm cross-eyed, but I'm still not sure if it's high relief or low relief.
I was just looking at examples of these last night trying to figure it out myself. I'm pretty sure yours is low relief, which is common with coarse reeds. On the reverse, these lines on the star are generally more visible on low relief coins. On the obverse, this leaf and the one on the other side of the stem from it are thinner on low relief coins. In addition, the tip of the one being pointed to is usually weak on high relief coins, making it appear shorter than the one opposite it. 40 Centavos are a lot easier to tell the difference. On high relief, the shorter rays emanating from the star will be thinner relative to the long ones. On low relief, they're all about the same width.