Until I found these two 50s, the largest chip I owned was the blue 100.

As you can see from the scan, one of the 50s is as large. The other is just a smidgen smaller.

Both chips are the only ones known of each. I've heard that the $100 chip has sold for $5k and I know there is more than one of those.

I don't own either 50 in your scan but I would love to compare sizes. It would be interesting.