this popped up today for sale in OZ, nice bit of gear !

Calibre 350 Rigby
Make John Rigby
Model Farquharson
Action Falling block
Scope Express sights
Condition Excellent
Serial No. 17032

Superb Rigby 350. One of a pair made in 1903 for Col. Wools-Sampson. Appears in Wal. Winfers definitive editions. Only 44 made, most likely less than 10 left worlwide