My Illinois database is the older one Billy, but it shows this as only being from a run of 150 units only made, so it looks pretty scarce. Someone else might have newer data so will be able to give you a better idea hopefully.
The data I have Billy says that the 150 only that were made all have the "Fishscale Pattern" (or 2nd pattern). This being a model 8, produced in 1913 and made between the serial numers of 2,577,501 to 2,577,650. Usually came with a bold arabic numeral dial.
I went back and read the earlier parts of this post Billy and seen Mike's post with regard to the 50 of the sunburst pattern. He is very up to date on the Bunns so that would be correct. As I said my data has a bit of age on it now, so it doesn't surprise me when new facts come to light.