One that is shaved for 45 acp has lost the serial number on cylinder. Same with one that got shaved and reamed to 45colt. But, one that was reamed and partially recessed to fire 45 colt and will still fire 455, will retain the cylinders serial number. While you may completely dismiss all modified guns as unworthy of your consiteration. I do not. Beauty in the eyes of the beholder. Not all of us are only interested in collect-ability.
Do I wish my 455 TL was unmodified, yes a bit, but I also like that I can fire 45 colts in it. Each to their own.