RK, NICE!!!! Let me remind all that your serial number is not 4771, but it is 4771u!! It is most important to include the suffix letter, if there is one. With respect to 1937 Military Mausers, it is proper to have a serial number of 4771, with no suffix. In this case, it would have resulted in a false record!!
Please guys
Don't forget the suffix otherwise it gets confusing and I'm confused enough as it is!!!