The aircraft was VH-TJE, it departed 2 minutes late and arrived 1 minute early.
Note the OP was not on the flight - their Wife and D-I-W flew; it's from them the report of an all economy configuration came.
These seats were not the Millennium seats of most 73H's the wife may have been used to.
They have "Convertible Seating" where the first five rows of this class can be changed from 3x3 (economy) to 2x2 (business) configuration.
As posted this is done by the armrests in the middle seat moving inward to make more lateral space for the window and aisle seats. Also the seat pitch is of 35", 4" or more greater then the pitch for the non convertable seating after row 6.
From row three I can understand why the perception of "All Economy" was achieved.
Here a photo from airliners.net showing the difference seats in the first 5 rows: (Click if for an enlargment)