I'll have a look thru what I've got at home tonight but i've got one of my Grandfathers last steam trawler Avondee A826 ( Strath class ) with the 12lb'er up in the bow. Its a general high/low angle mounting just in front of the forward accommodation access hatch.
Not very clear I know but better than nothing I guess. Notice the wheelhouse is covered in heavy oak planks to give some protection against straffing from German aircraft and the walk way around the whelhouse that was removed post WW2 in the bulk of the remaining Strath class vessels.
Davie Tait