The pedal of this Broadwood is present, but detached in the picture above. We are not quite sure of the date of this one, but the reference to John Broadwood's 'Sons' puts it at post-1808, when his second son (Thomas) was made a partner in the business.
1812 is a guess, based on the blonde nameboard, and style of the name-cartouche.
The unusual feature of this one is that, although like all Broadwoods after about 1807 it has 'Dolly' dampers in place of the brass under-dampers, it still has the single action. This option was included in the Broadwood price-lists until well into the century, but this is the only one I have actually known.