"Monitzed" is an interesting "weasel word". I had never seen the word applied to
US coinage until the 1933 double eagle fiasco. The government used the claim that the coins were never "monitized" because they were never turned over to the Federal Reserve and because of that they were not really coins and still belonged to the government. Well NONE of the
US coins were turned over to the Federal Reserve before 1913 because it didn't exist. So how were those coins "Monitized"? Also as soon as the coins are struck the government treats them as coins, records the seigniorage and transfers it to the general fund even before the coins get shipped to the Fed. So the government seems to think they are money even though they aren't "Monitized".
They don't count any seigniorage on patterns so they don't consider them to be coins. So I would say they are NOT "monitized". But they are legal to own, at last those up to 1890, Legally those after that aren't legal, but the government hasn't tried to confiscate them. Except of course for the 1974 D aluminum cent which they claim they never made. They have made noises about how the 1974 aluminum cents and the 1974 bronze clad steel still belong to them, but they have never made any attempts to reclaim them. They have also made no comments about the various Martha Washington patterns that have appeared on the market or the various 1916
Mercury dime and
Walking Liberty half patterns that come up from time to time.