I would guess it was discontinued about the time of WW2.

WRA Corrosive primers would have been copper colored, the later noncorrosive ones nickel plated for identification.

These are .32 ACP rounds from WW1 and WW2 era, respectively:

 

Ed....you are an unplummed wealth of info here! They are indeed copper colored...no box unfortunately.

 

Can tell you from experience the copper colored primers will be DEAD and no point in trying to fire them. The rounds are collectible.

WW2-era rounds with noncorrosive primers are sure fire and fairly common. Hotter than modern stuff!

I shoot most of what I find at estate and yard sales, unless I find particularly pristine boxes in nice condition, which I then sell to collectors. Here is some WW2 German which came with a pistol I bought.

Velocity tests of old .32 ACP ammo from WW2 era acquired at estate sales. Test guns were Beretta Model 3032 Tomcat with 2.4" barrel and CZ27, steel frame 3.9" barrel.

WW2 German, steel cased, Geco Berdan primed loaded with a 5 gram (77- grain) FMJ bullet.
Beretta Tomcat 2.4" barrel, was 907 fps, 14 Sd, 38 ES.
CZ27 3.9" 981 fps, 17Sd, 52 ES.

Western 74-gr. FMJ commercial pack WW2 Army overstamp rounded nickel plated primer, noncorrosive
Beretta 2.4" Tomcat 923 fps, 28 Sd, 76 Es, n=7 rds.
CZ27 3.9" 1001 fps, 15 Sd, 36 ES - This is HOT stuff!!!!

Current production Fiocchi, 73-gr. FMJ
Beretta 2.4" Tomcat 840 fps, 15 Sd, 44 Es n= 7 rds.
CZ27 3.9" 917 fps, 11 Sd, 27 ES, VERY UNIFORM, accurate.

HANDLOAD Accurate 31-087T, Flatnosed, bevel-based, cast
5.6 grs. Alliant #2400, Federal 200 small pistol magnum primer, OAL 0.965"
Beretta 2.4" Tomcat 825 fps, 27 SD, 65 es N=7 Rds.
CZ27 3.9" 939 fps, 18 Sd, 43 ES, n=8 rds. APPROACHES .380 ENERGY!!