That would appear to be way too cheap.

Purdey 450/400 2-7/8" express Double Rifle
Snap Action Jones-type Underlever
Side clips
Island locks with Stalking Safeties
Orig Purdey case (oak with canvas slip cover)
Orig tools

fifteen hundred euros

Is this an announcement for an auction or a rifle for sale?
The case should sell for that or more...

Cheers
Tinker