Personally I would say $250 to $300. That is only because the yellow #2, until a #1 was found in quantity, was the most common.

However if you had two Cuban collectors bidding that needed it, I could easily see $400 to $500

I think most deep pocket collectors have it

If I needed it, I'd go $300

Having said all that, most of the Sans Souci roulettes do go for about $500