Technically the Amiga Platform has always been rather agnostic about it's timing & video output. It spits out PAL / NTSC / RGBS in various funky resolutions, all you have to do is ask or set a jumper depending on the model. Secondly if it wasn't for this spot on NTSC carrier frequency that the Amiga could output we would never have seen products such as the Video Toaster. http://en.wikipedia.org/wiki/Video_Toaster

Or this oddity, the A2024 with a 10hz-15hz refresh rate: http://www.amiga-hardware.com/showhardware.cgi?HARDID=863