Nothing more than the FN Model 1910/Browning 1955 with a few added features to make the BATF Point Total necessary for handgun importation under the '68GCA.
They took a nice pocket handgun and added some target type features to make the OK to import point total.
It;s a pistol not really suited for either role anymore, and the sales reflected it.
I guess that makes it kind of rare now and maybe valuable once again(?)
The basic design is JMB and a good one. No problems there. I think all the 10/71 Models were in .380acp. The extended slide of the Model 10/71 makes for it's own special bbl aside,,a difference from the older Model 10/55.
The other internal parts are the same.
They added target grips and sights to get extra points in the system too.
It lasted only a few yrs,,discontinued in '74 or 75 IIRC.