Has anyone ever seen a dial like the one shown below on a Ball-Hamilton 18s watch? That is what it fits.

Here is the front view of the 18s dial.

Here is the back view of the 18s dial.

John here are some photos of my 18 size Ball with a Single Sunk CPR 12 hour Arabic dial, they would have been used on CPR's Eastern Region from Fort William, Ontario through Québec to Halifax, Nova Scotia, and St. John, New Brunswick on its Atlantic subdivisions, Prince Edward Island had narrow gauge railway’s, and Newfoundland didn’t join the Canadian Federation until March 1949. From the start of time service on the CPR the 24 hour system was used on the western lines from Lake Superior through Ontario, and the Prairie provinces of Manitoba, Saskatchewan, Alberta, and British Columbia which included the CPR's subsidiary the Esquimalt and Nainamo on Vancouver Island. In 1959 the 24 hour system was used from coast-to-coast.

The movement is an 18 size, 19 jewel, Serial No. 586841 in a yellow gold filled case.

Ball CPR 12 hour Arabic Dial with bezel off

Ball 18 size, 19 jewel, movement

Larry, that is a beautiful answer to my question. Thank you very much. You have not only provided valuable horological information but, also, interesting and relevant information in relation to Canadian history.

We all now know that the conventional wisdom that Canadian dials are 24h does not entirely cover all of the circumstances that truly existed. Well done!

JBS