Anniversaryclocks.org needs you to answer some simple questions about the backplate of your clock.

The name on the dial is of no use when trying to identify the factory that made the movement. You can buy a clock today with 'Harrods' on the dial, but Harrods do not manufacture clock movements.

Backplates sometimes have a name stamped on them, and may or may not have a Logo.

Generally, the numbers on the back have no meaning unless they are in a circle or within or next to a name or logo.. They are mostly meaningless serial numbers, and in an attempt to intimidate the competition, these numbers implied massive production figures, far in excess of the actual number of clocks made.

A typical backplate:

For rectangular plates, just measure the width and height.
For circular plates, use the diameter for the width and height.
For odd shaped plates, use the width at the widest point.
Some plates, in particular a few Schatz models, incorporated legs. If the legs are the same piece of brass as the backplate, use the total width and total height of the whole plate including the legs. If the legs are screwed to the backplate, just measure the plate.