Updated 19 June 2012

HMS Indomitable in March 1941
4.5" (11.4 cm) Mark I and Mark III guns in Mark II BD mountings
Note that the mountings narrowed the flight deck both fore and aft
IWM Photograph

Either HMS Implacable or HMS Indefatigable with HMS Anson in the background
4.5"/45 (11.4 cm) Mark III guns in RP10 Mark II** BD mountings
Compare these mountings to those in the picture above
IWM photograph (CPL)

HMS Ark Royal in late 1938 or early 1939
4.5" (11.4 cm) Mark I guns in Mark III UD mountings
U.S. Naval Historical Center Photograph # 19-SB-2J-1

HMS Cockade in July 1947
4.5"/45 (11.4 cm) Mark IV guns in RP50 Mark V mountings
Photograph from Allan C. Green collection of glass negatives
State Library of Victoria Image H91.250/187

Battle class destroyer HMS Barrosa
4.5"/45 (11.4 cm) Mark III guns in RP10 Mark IV mountings
IWM Photograph

For Mark II Mounting (Capital Ships and Carriers):  Deck Mark II
For Mark III Mounting (Carriers): Twin 4.5 HA LA
For Mark IV Mounting (Battle class): Mk IV Naval
For Mark V and RP50 Mark V Mountings (Z, Ca, Ch, Co and Cr classes):  4852, 7164, 7165, 7166 and 7167
For Venezuelan Nueva Esparta:  Mounting swung crane, 0714 and Twin mounted Esparta
For Venezuelan Zulia:  0726 and 2241

19 June 2012 - New datapage