Large brass artillery shells help

I have 2 of these shells was wondering if anyone can help with some info on them

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Pretty sure it if British Navy 4.5" case for the main guns on their destroyers circa 1940s to present.

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This is a 4.5" Mk3-5 gun case made by Edward Curran & Co, Cardiff, Wales.
N4 1960 date is quite early and nice. The N3 cases from late 1940’s had 4 sets of mouth cut-outs instead of the later threaded mouth. This thread accepts an alloy or later plastic plug as the rounds are separate and not a fixed round. Usually 2 barrels on Navy ships.

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Thanks guys, do you know a ruff figure on what they would be worth, and should I clean them up or leave them as is ?

The value depends where you are located - which country. Never clean large calibre/caliber cartridge cases unless they are badly corroded - this one isn’t. It doesn’t add any value to them and purist collectors would say it actually reduces their value.

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Im located in melbourne- Australia

Should be worth $75 but I see them in antique shops for up to $150 which is absurd.
I am in Ballarat.