Standard-Modell 1924

So I recently picked up this rifle....I thought it was interesting because it has a replaced barrel with a sight hood. Upon inspection, I believe this rifle to have started life as an Ethiopian contract rifle. It has the crest faintly stamped into the buttsock. I think at some point it was in the possession of the Germans again, as the barrel is DOT coded and has a waffenamt. I cant quite make out what the waffenamt is, but it looks like wa63 with a circled "HK" next to it. Also on the barrel is what appears to be a lion. The barrel and rear sight are un-numbered, the rear sight also has a waffenamt, but I cant make out what it is. Overall I think its a cool rifle, I like the replacement barrel. Rifle is all matching except the handguard, I'm guessing it was replaced with the barrel. Looks like an original sling as well.