I would say the 1923 is too worn to have any numismatic value above the melt value - .2237 oz. The 1918 is a bit nicer and I think it is a keeper but there is not too much value beyond the .4205 oz of silver.
From 1920 the silver fineness changed from 92.5% to 50%.
The pre-1920 coins are often found in much better condition than those after 1920, partly because they were hoarded by the public after the silver content was reduced, and also because they were more hard-wearing than the 50% alloy coins.
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