Except for the earliest Tiger-Eye style Sunbursts, and other very early styles, I wouldn't be able to tell between Master Marble or Master Glass.
Also, I wonder if yours is Asian.
For me it would be between Akro and Master.
And the seam is long enough that I think Akro.
The blendiness of the colors seems more like Master, but I'm voting Akro.
It does look Akro to me. I think those would qualify as eyelashes.
Not eggyolk or oxblood though. The only famous bloodied eggyolk I know is the oxblood eggyolk. Like this one: http://marbleconnection.com/topic/23022-oxbloods-show-me-some-please/?do=findComment&comment=207033
I'm not sure what you mean by nesting.
These are definitely Marble Kings, so Marble Kings must be able to nest. I'm just not sure which exact part of the marble you're saying is nesting.