1891 Argentine Mauser

I picked this up recently. The receiver is marked Lowe Berlin. The serial number indicates that it was made by DWM in 1899. Lowe became DWM in 1896. The rifle behind it is a Enfield Mk4.

https://www.milsurps.com/images/impo...10837202-1.jpg

https://www.milsurps.com/images/impo..._0815202-1.jpg

https://www.milsurps.com/images/impo..._0816202-1.jpg

Sharp looking gun.

Can anyone tell me what the E. N. on the receiver is?

I believe the E.N. stands for Ejercito Nacional which means "National Army". It was a property marking as I understand it.