user: Question: In Early 1873, Owen Sound had what works number?
Columns: ['Number', 'Name', 'Builder', 'Type', 'Date', 'Works number']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Gordon', 'Avonside Engine Company', '4-6-0', 'Aug 1870', '799']
SQL:

assistant: SELECT "Works number" FROM "Table" WHERE "Date" = 'Early 1873' AND "Name" = 'Owen Sound';