FWIW, the WWII era Remington-made A-5's, based on the Remington Model 11 but with Browning markings, all had letter-prefixed SN's.
In 1947, Remington would have been back to making their own version of the A5 again - with Remington ILO Browning markings.
It's mis-leading to use the Browning website just because Remington used a Browning design - it wasn't a Browning gun.
As a Remington, the rear of the barrel should be stamped with a Letter Date Code (two or three letters) on the LH side, just forward of the receiver, that can be used to determint the DOM.
The first letter of the Code is the month of manufacture, followed by one or two letters which are the year of manufacture.
Month Codes: [first letter]
B - L - A - C - K - P - O - W - D - E - R - X
1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12
Year:______Code: [second (and third*) letters]
(a sampling of 9 years, below)
As an example, using the above table, a barrel with the code "CSS" would have been made in April 1947, hopefully still attached to it's original receiver.