This is a series of b&w cards, probably printed by J. Walch & Sons themselves at their printery in Hobart. 

Series Contents: The full  list of cards in the series is not know.

Date Published: 1907.  The earliest postmark date I have seen is 15 April, 1907.   

Printing: The cards were printed by letterpress halftone. J. Walch & Sons had had this type of printing press in their own print shop in Hobart since 1900, so it is most likely that the cards  were printed there.

Number in Series: Probably 12.

Identification:  The imprint on the back left margin is “J. Walch & Sons, Wellington Bridge, Hobart – Series J”.