Searching google “Speck salt” is salt used to cure ham (or speck in German)
I think we must have found the same link on Google. I am assuming at this point that it is the coarse Kosher salt my mother used for making pickles, curing meats, etc. My mother was 3/4 German and 1/4 Swiss, although she and her parents were all born here in the United States.
Her grandmother had been raised on a pig farm in Germany and emigrated from Germany to the U.S. in 1884. My mother learned a lot of her cooking skills from her mother and her German born grandmother, so it would make sense that my mother would refer to the coarse Kosher salt as speck salt.