You are purchasing 12 NOS (New Old Stock) exhaust valve seats for the Jaguar V12 H.E. XJ12 XJS. 

These are .003 oversize.

Each seat is marked M.W.W. Spec 1.504 (photo 2 and 3).

New from a vintage British inventory, part number EAC3641 .003.   {B W}

Photos are the actual part.

Please see our auctions and ebay store for more NOS new and one of a kind parts.

Thanks.