It is not very easy to find a rifled carbine in 15 mm resulting from the patent of 1859.
Finding the big brother of the LF 521, that is to say, the LF 520 takes a stroke of luck.
Here they are together for a while. 
For both in detail, click on the links below
Nice. You get your elf mark again on these:
Maybe he was tired of showing the image of his dad’s gun on his markings and wanted to try out his own.
Perhaps, but why didn’t he continued on the M1862 -M1864 and M1868 and if it was only for the rifle … but no , we only found the ELF marking on the M 1859 arms.
