I did wonder, when I emailed them via eBay, they replied: I'm sorry we really do not know. But they would all be NTSC as these were all purchased from the closing of Kaybee Toy Stores in the USA.
The listings are on ebay, but seem to be new boxed, but all advertised as NTSC, but with different # numbers. i.e. #RD89.
1. 303474813701
2. 293562799033
3. 303508795972
4. 293529146793
These are I think all the same seller, so not sure if they have different boxes from different closing stores, however my initial thoughts were its the hardware/console that scans and produces video output, plus it would scan the controllers ports for a signal, so I am not sure there is a massive difference with NTSC or PAL for a controller. I know Games are meant to work on both platforms.
I was thinking of buying one, even with the high shipping, but needed clarification over the description, although it seems they have bought them as non-sold stock and now selling off separately.