All rose/coral gold, non-engraved versions.
1941+42+43 showing The Lieutenant on leather band
1942 advert with Ranger on bracelet
1942 advert with Cadet on expanding bracelet
1943 advert with Lieutenant on leather band
1943+44 showing Cadet "B" on expansion bracelet/leather combo
(ad has watches around the wrong way)
1946 adverts showing as Bruce "B" on expanding bracelet
1946 adverts showing Cadet "B" on expansion bracelet/leather combo
1947 advert with Bruce "B" on a expansion bracelet.
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1941+42+43 + expanding bracelet = Cadet
1941+42+43 + leather band = Lieutenant
1942+43 + bracelet = Ranger
1946-49 + expanding bracelet/ leather combo = Cadet
1946-47 + expanding bracelet = Bruce
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In reply to Comments welcome if you find by mybulova_admin
I've come to the conclusion (possibly a no-brainer) that Rose and Coral are 2 different Colours, Coral having more of a Brown/Orange tint over Rose.
1940 'LINCOLN' with Coral Dial http://www.mybulova.com/sites/default/files/watches/1940BulovaLincoln5272013.jpg?1369663491
1941 'LINCOLN' with Rose Dial http://www.mybulova.com/sites/default/files/watches/1941BulovaLincoln4232012.jpg?1335225427
The fine print of the 1942 ad http://www.mybulova.com/sites/default/files/vintage_ads/1942-Bulova-ad-5b.jpg describes the 'RANGER' as being Yellow Gold on Tan Leather whilst the 'LIEUTENANT' is Red (Rose) Gold on the same.
1943 ad on left. 1946 ad on right.
So ad says there is a "new and popular Coral Gold" in 10k for Cadet B in 1943.
Then a 14k "Red" Cadet B in 1946. Do we ever see Red or Rose Gold in anything other than 14k?
Here's a snippet from a "10k Rose" Spencer ad that I think dates to 1943, and a 1941 "10k Red" Attorney .
I though those few cases we have seen which are suspected to be Rose/Red AND marked 10k were actually the "Coral" gold, but apparently not. Guess it just depends on the amount of copper in the alloy.
I think all the names used are just the writers using their imagination in describing a single colour-red gold. You only have to look at the two Cadet 'B' descriptions, the same watch in both ads has two different names for the same composition.
Any pictures of red gold plated cases that look different in shade to others can be explained by different lighting conditions, and ads that look differently coloured are simply using different printing ink, or again lighting conditions.
I have yet to see a red/rose/coral case use other than 14K gold in the plating.
I have a 1945 cased Spencer, it is 14K rolled gold.
The "10K" write-ups are simply a mistake in my opinion, either laziness or lack of attention to detail.
The gold fill, being an alloy, does tarnish, and will yield a wide variety of shades, especially if it has been untouched for long periods of time. To actually compare the two, you would have to take an example of each, and polish the cases in exactly the same way, and critically examine the end result. We always polish the cases during an overhaul, and the finished result always elicits comment from the customer as to the colour of the gold.
In addition, I should add that freshly polished cases stored for any length of time in watch boxes with synthetic fabric linings will tarnish and darken due to the off-gassing of the textile, and in some cases, types of glue used in the construction of the box, or even the wood itself. Even writing in the case back with a fine point sharpie will off gas and deposit a film on the movt. (Most commonly seen in quartz watches)