The Tank Louis, which was officially released in 1922, retained the classic influences of the original with its Roman numerals and 'rail track' minute scale.

Source: https://www.dailymail.co.uk/femail/article-12072083/Here-Royal-Familys-favourite-watches-decades.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

Underneath sit the Roman numerals of his grandparents’ birthdays.

Source: https://www.dailymail.co.uk/sport/football/article-12712231/Brennan-Johnson-admits-big-decision-swap-Nottingham-Forest-Tottenham-summer-got-messages-David-Beckham-Gareth-Bale-move.html?ns_mchannel=rss&ns_campaign=1490&ito=1490

“We have two Hublots that do not use the numerals but have Arabic calligraphy on the dial,” he says.

Source: https://www.ft.com/content/38d4c1a8-cf99-4585-990d-a7e2a7310a90