I'm pretty sure the WR .375 2 1/2" in the photo is a Rifle made for the trade by WR for I think TJ Lake of Adelaide. TJ Lake was a crack competitive shooter in the earlyish 1900's. He was very hard to beat and won nearly everything when he was a competitive shooter. He also had a gun shop in Adelaide, hence why I believe the rifle was a trade rifle made for TJ Lake The particular serial number of that rifle matches a serial number of Westley Richards from around the early 1900's.