It’s just Odd - I have two (2) Shops in Germany helping me track down a proper used & nostalgic European Make/Model large than .375 H&H & under a manageable budget.
One shop shared: Rigby Co. & German Mauser recently
rejoined to build three (3) affordable rifles: PH, Big Game, Vintage. Rejoined meaning: many years ago Mauser built Actions & Barrels for Rigby Co. & Rigby in-turn assembled, proofed, etc. in their London shop.
The site you shared: PH Model (see PH on the pistol cap), Rigby offers the double square bridge in .375H&H or .416 Rigby only.
Goes back to
ODD: that someone would order a rifle, remove the original barrel, sub w/ non-factory offered barrel/caliber & ask near,
factory new price? The base on a True Rigby PH ($/£) $11,500.
For me - if the goal was an authentic Rigby/Mauser rifle & in a Big Boy Bore like .404 Jeff, order .416 Rigby &
retain the rifle’s value.
I’d