CREATE TABLE table_41506 ("Number" FLOAT, "Name" CLOB, "Builder" CLOB, "Type" CLOB, "Date" CLOB, "Works number" CLOB)

In early 1873, Owen sound had what works number?
SELECT "Works number" FROM table_41506 WHERE "Date" = 'early 1873' AND "Name" = 'owen sound'
SELECT "Works number" FROM "table_41506" WHERE "Date" = 'early 1873' AND "Name" = 'owen sound'