1921 No Mint Mark Morgan Dollar

I know this is a pet peeve of mine, but get out of the habit of saying " no mint mark" when specifying a coin. It's meaningless. Philadelphia didn't put a mint mark on coins until 1979 (with the exception of wartime nickels). You can just say 1921 and Philadelphia is assumed, or 1921-P. I think this " no mint mark" stuff comes from the get rich from pocket change junk on YouTube etc, because of a rare number of proof coins without the S, and now people seem to think saying " no mint mark" means something.