19th century Month Dated Rail

"California Iron from the G. J. Graves Collection" has several of examples of 19th century month dated rail:

Wilson and Cammell Rail indicates "10.1881"

Cambria Steel Rail, 1874 has nine dots indicating September

Moss Bay Co. English Steel Rail, has eleven dots just in front of the "1887" indicating that it was made in November

Scranton Steel, "11 '77"

Springfield Steel, "5 1881"

North Chicago Rolling Mill, "XII 1883" indicating that it was made in December