Restoration one of the first Rolex watch ever made - antique/historical military silver case

It has a 0.925 silver-cushion case and is powered by the Rolex 600 handwind-movement. The Rolex 600 movement was introduced in 1922. Based on the stamps on the caseback this watch should have been made between 1923 and 1925. Giving the fact, Rolex was born in 1920, it can be said that this watch is one of their first model ever made.