Here's our third and final Mark https://www.diyblocksx.com/product-category/space-series/ 1, only in this case the lume is thinner https://www.xbrickpro.com/product-category/mini/ than the fat ones seen on the earlier Mark 1's. With these last numerals, we see the Matte dial 1016 settling into a balanced look that will be carried forward into the future, rather than the puffy numerals of the earliest Matte dial examples. The Mark 1 is the first of the matte dials, but it's also sometimes seen in later cases, though it's unclear if these are https://www.diyblocksx.com/product-category/city-blocks-series/ original. This watch has a serial number dating it to 1972.