This is a series of b&w cards, probably printed by J. Walch & Sons themselves at their printery in Hobart.  There were two printings of the series; the back is printed in black in one printing and in brown in the other.

Series Contents: The full list of cards in the series is not know; the ones I have seen are illustrated here.

Date Published: The publication date is uncertain. The earliest postmark date I have seen is November 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: Unknown.

Identification:  The brown-back printing has the imprint along the left edge of the back, in two lines:

Series C

J. Walch & Sons, Wellington Bridge, Hobart

The black-back printing has the imprint in one line:

J. Walch & Sons, Wellington Bridge, Hobart – Series C