Did Colt ever make Pythons with a BY prefix or would it be a PY?Store is calling it PY, but it really looks like a BY to me.Also what would extra letters mean under a serial number?
It looks like a P with a . under it.
Most likely a 1991 or later gun. Check the front sight pin to see if it is a single or double pinned front sight. If a single front sight pin, it is a 90's or later vintage.What year is the KT prefix?