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There are only two classified ads concerning the ROVER 12 hp "Silent Knight"

This advertisement promotes both Knight models - the 8 hp and the 12 hp.
Source: THE GRAPHIC, 20 May 1911

SILENT KNIGHT ROVER
Motoring need not be one continual expense. If your car be a ROVER.
ROVER CARS are „Famed for Economy and Everlasting Wear.“
THE SILENT KNIGHT ROVERS are entirely produced by the Rover Co’s works.

The 12 h.p. is supplied as a two-seater at £325, also as a touring car with flush-sided phaeton body, or with closed two-seated body suitable for doctor’s use, at £350.
The 8 h.p. is supplied as a two-seater only at £250. Write today for full particulars.

Diese Anzeige bewirbt speziell das 12 hp Knight Coupé.
Quelle: THE GRAPHIC, 8. Juli 1911

The Silent Knight ROVER 12 H.P. Coupé
Dignity, Silence, Comfort, Economy.

Unfortunately the rest of the text cannot be deciphered.