Dimples left on the spent casing

[lugerholsterrepair]

Yes..That is normal for many Luger cases. I have observed them myself and if they have a dimple..they were fired in a Luger. When the case is extracted it is captured by the extractor untill it 's base hits the sharp edge of the ejector..The ejector forces the cartridge case out many times straight up or sometimes to the right..I suspect the case encounters the edge of the bolt face or some edge somewhere as it is being very forcefully kicked out of the pistol and the dimple is made at this time. It's also possible the cartridge is spun upwards with such force that the extractor sticking out forward of the bolt face dimples it. Hard to tell but that's my theory!