I have all of two melon balls. I pulled out the white one and hoped for opalescence, but no. I tried to imagine that I was seeing a hint of orange, but it was just wishful thinking.
I did get a little fire coming through the blue one.
I don't know how to judge the pontils. Faceted I think on the white and maybe melted on the blue, but not sure. The marbles came with a date -- July 14, 1879.