Yep. 'WA' is Hugo Schneider A.-G., Werk Leipzig, Germanyicon. The '44' is the year it was made. The 7.92 x 33 is the original assault rifle cartridge. The AK was basically copied from the Stg 44 too.
http://stevespages.com/jpg/cd792x33kurz.jpg
Headstamp Codes - International Ammunition Association