If you are sick of the markings coming off the case or case is cracked here is a approx $7 fix. I bought one for my C70 Mk1 and was skeptical but thought it was worth a try. Arrived today, it looks good (imo) and buttons work through leather (?). No idea how long it will last. Here is link:
https://www.aliexpress.com/item/4001093894253.html?spm=a2g0s.9042311.0.0.6f914c4d2OHvtxYou can probably find them on ebay as well, I just never seen it before
