A missing Hawaii so called 50c variety was finally found! A low volcano variety with thick planchet. See my ANA blog for a previous wrte-up from December 2016. https://www.money.org/collector/drdarryl/blog/hawaii-so-called-50c-low-volcano-vs-high-volcano-variety
There are now 6 varieties of the Hawaii Statehood so called 50C.
Close-up pictures are to be shared at a future date. (Reverse image below was rotated to level the volcano).