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Dear Ms. Garrett,
Thank you for posting your request on History Hub!
In the early years of the Bureau of Immigration, there were U.S. inspectors in Halifax who manned an immigrant-inspection station for passengers going to the U.S. from Canada. There was a formal agreement in place with the transportation lines of Canada that when an alien passed through one of these inspections stations they could be granted an immigration certificate that would allow them admittance to the U.S. without further examination as they crossed the border. The alien was expected to surrender the certificate at the U.S. port of entry. There is information about the requirements surrounding this process in the annual reports of the Bureau of Immigration (ex. page 46 of the 1902 report).
We believe that the numbers written next to the stamp relate to an immigration certificate that was granted.
We hope this is helpful.
[Information provided by Elizabeth Burnes, Subject Matter Expert]
This explanation answers my question. I also appreciate the link to the immigration document. Tack, tack! (Many thanks) Martha Garrett in Sweden