Mike, she did have 20mm mounts. They were the standard light AA mount from about 1942 on. Starting in 1945 the Navy started doubling up and putting twin 20s on some ships. You can see a twin 20mm here:
http://www.ussslater.org/weapons/20mm.htmlA bit of history of the gun and some photos of the single mount are at :
http://www.navweaps.com/Weapons/WNUS_2cm-70_mk234.htmBack to Nevada.. we know she had 20mms. Look at this photo:
http://www.navsource.org/archives/01/013644.jpgThere's a tub of them on the bow in between the anchor chains, andother set of 2-3 just outboard the second barbette, and two at the base of the stern aircraft base, to start. There may be more, but she's not my expertise, which is why I haven't answered as to whether she had twin 20s at all.
We can make a guess based on her "Dictionary of American Naval Fighting Ships" (DANFS) entry for 1945:
Quote:
Her gun barrels were relined at New York, and she sailed for the Pacific, arriving off Iwo Jima 16 February 1945 to give marines invading and fighting ashore her massive gunfire support through 7 March.
On 24 March, Nevada massed off Okinawa with the mightiest naval force ever seen in the Pacific, as pre-invasion bombardment began. She pounded Japanese airfields shore defenses, supply dumps, and troop concentrations through the crucial operation, although 11 men were killed and a main battery turret damaged when she was struck by a suicide plane 27 March. Another 2 men were lost to fire from a shore battery 5 April. Serving off Okinawa until 30 June, from 10 July to 7 August she ranged with the 3r d Fleet which not only bombed the Japanese home islands, but came within range for Nevada's guns during the closing days of the war.
Quite a lot of text for seven months, eh? Regardless, it doesn't mention any overhauls after New York, and if that is the case, she's unlikely to have carried the twin 20mm. It is possible they were fitted at a forward base, however, so it's not a sure thing.
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Tracy White -
Researcher@Large"Let the evidence guide the research. Do not have a preconceived agenda which will only distort the result."
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Barbara Tuchman