Omega National 1900-1920

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Hello!.
Can anyone help to know more about this old Omega. Its been in my family for several generations. It is a national Omega, made for Chilean market and selled by Luis E. Sinn. I don´t see a serial number in the movement and there are several marks on the cap that i don't know how to read or interpretate.
How can I get the year of production?
What does the following marks means?
  • DX7 5/1
  • 409146