Digby Antiques (Wiltshire) has dated this piece to the 1920s.
The regiment underwent a number of name changes these are the 9th.

The badges depict two crossed Lances, are each marked to the back for London 1917 and the Goldsmiths & Silversmiths mark.
Both in super condition, both have fully working pins.
Large pin H 4.7 cm W 3 cm
Small pin H 3 cm W 2.4 cm
Would be prepared to split if requested.
Digby Antiques (Wiltshire) has dated this piece to the 1920s.
You can view the stock and full dealer information on the Digby Antiques (Wiltshire) Profile Page