Is it new or an older one?

Navy Arms never made a revolver, just imported them as you stated. Depending on it's age, many of their Revolvers came from Pietta and some from Uberti which cost more. If the manufacturer's name is not on the gun, you can sometimes tell by the proof marks, Uberti is an octogon with a circle in the middle, Pietta looks like this: <FAP>. Not sure but they may have used the now defunct ASM-(Armi San Marco) but I don't think they ever used Pedersoli due to the cost.

Enjoy your gun, the .36 is a sweet handling gun and will skip a can all day, you many have to lube the cylinder pin now and then.

Doug