The Shipwreck PW is Caithness and was designed and made by Peter Holmes in 1972
with an edition size of just 50 and all were produced. This weight has a PH cane hence
the possible confusion.
Only a few Caithness designers makers were allowed to put in their own sig cane in weights
sold as Caithness. Willie Manson (WM), Jack Allen (JA) , Allan Scott (A) , Harry McKay (H)
and Shona Spittal (S) are others that spring to mind