Yesterday asked seller for photo of buttplate opened, no response yet. It is a G&H mount, but the question is who installed it. Have to see the left side of the rifle, asked for that photo too. G&H machines and polishes over the screwheads and pins holding the base to the receiver (and incidentally has to reblue the receiver) when installing the mount. A few other high class smiths in the classic era, who bought the mounts from G&H, also did this, but most did not.