Alaska Seas 1954

Among a sprinkling of picturesque matte paintings there is some very well executed model boat sequences in this film with the visual effects supervised by John P. Fulton.

Most of the miniature action centres around ice falling from a glacier onto a couple of salmon boats. The break up of the ice is fairly well done. One stand out shot is where the rudder and prop is broken off a boat sliding off a rising chunk of ice. 

A good proportion of the miniature work is used as rear projected process scenes for live action in the foreground. A few of these process screen miniature shots have moving mechanical figures on the boats which really brings them to life. 

The matte paintings are combined with both live action elements and in some case miniatures.

The whole movie can be found on youtube.

UPDATE: Thanks to NZ Pete's comments (which you can read below) I now know virtually all the visual effects miniature  and matte shots were taken from 1938's Spawn of the North with the miniatures supervised by Gordon Jennings. The effects were awarded a special Academy Award for this work.
You can find the NZ Pete's excellent and thoroughly researched Matte Shot Blog here.

Matte painting of a Native village

Matte painting background with a live action foreground.

Almost all matte painting except for the water surface and small boats which looks like a miniature.

Figures on the background miniature boat are mechanically animated.

Another live action foreground combined with a matte painted background.

Devil and the Deep 1932

 Some interesting early submarine miniature work in this film with the underwater shots being reasonably well shot. The surface shots are less successful as the scale is probably too small, the water being a bit glassy. Also suffers from some foreground soft focus.

Morituri 1965

Almost all of the ship action in the movie was shot on a real freighter but there is a cutaway to a tanker on fire and exploding at night which is a miniature. Another exploding ship miniature can be seen as a rear screen projection from the bridge in daylight and as a cutaway.  A still of a tanker model attributed to Morituri can be found in an old studio auction catalog as lot 855. 

There are a couple of stock miniature shots (lifted from older movies) of a submarine and a close up of a torpedo being fired. There is also one stock shot of a convoy in miniature covered in a layer of added fog.

Stock submarine shot.

Stock convoy miniature shot with added fog.