s/n 7648xx shipped 4/41. It was a 5" barrel as well.
One of our members, Absalom, earlier stated the change 4, Models of 1905 after s/n 690000 generally were supplied to support WWII war efforts.
I own s/n 7651xx which also shipped in April of 1941. I also own s/n 7796xx which shipped Jun 1941.
After the war it was coverted by Parker Hale in Great Britain to its current configuration