Snows star rating system
1 star, no more than a 2x premium over non variety
2 star, 2x-3x
3 star, 3x-5x
4 star, 5x-10x
5 star, 10x+
So, your coin has a 3 star rating. However, I think you would find it very difficult to get a premium of 3 to 5 times over an 1899 non variety of the same grade. Even Snow admits that these ratings are vague and subject to change.
I think pricing of many varieties can be very difficult. Normally, you could look at completed sales from places like
ebay, Heritage,etc. However, sales information on many varieties is very limited. I think you would be hard pressed to find any completed sales information on your variety.
Bill Fivaz discusses variety pricing in his
CherryPickers Guide. Basically, it boils down to supply, demand, and eye appeal. A rare variety in high demand is going to have a higher premium. Also, the more visually dramatic a variety, the higher its premium. Dramatic widely separated repunched digits, dramatic doubling, overdates, etc will usually carry a higher premium.
So, with a variety with very little pricing information, I would try to determine its value with no premium attached. Then, compare your coin with other similar varieties that might have more pricing information. Attach a premium that you think is reasonable looking at all the above factors.
You might want to look at the CherryPicker's guide where Fivaz has many
IHC varieties listed comparing their variety price for various grades to non varieties. Unfortunately, your variety is not listed. However, this still might be a good starting point to see how some varieties are priced.