Welcome Aboard. Walther has a dating system that includes the Two-Letter Group that is on the slide and barrel of your pistol
A = 0
B = 1
C = 2
D = 3
E = 4
F = 5
G = 6
H/I = 7
J = 8
K = 9
So my P99 with a "BF" date was made in 2015.
I always field strip and clean a weapon first. No way to know how long its been in disuse and making sure you are not firing a dry pistol is a good way to ensure you take good care of your weapon.
A = 0
B = 1
C = 2
D = 3
E = 4
F = 5
G = 6
H/I = 7
J = 8
K = 9
So my P99 with a "BF" date was made in 2015.

I always field strip and clean a weapon first. No way to know how long its been in disuse and making sure you are not firing a dry pistol is a good way to ensure you take good care of your weapon.