You have a great 41 mag. I have 657 PC hunter and a 57 in nickle Pinned and recesses. I hope to someday get an old blue 4 inch.
Your CDE prefix serial number makes it a 1999.
The -4 prefix was started in 1998. The change was a frame design to eliminate the cylinder stop stud, eliminate serrated tangs, change to MIM hammer with floating firing pin, change to MIM trigger, change internal lock works.
Do you reload?
HTH
Fred