That's a nice coin you've got. It will command a good price based on it condition and eye appeal.
The varieties are tricky. I looked for a side-by-side comparison of the varieties but could not find one. My image was made by copying images from my database.
ROED -- Round O Even Date -- The "normal" coin
ROLO -- Round O Low O -- Valuable in high grades
OVAL -- or Narrow O -- Very valuable.
If I squint real hard, I think yours is a ROLO. Do you agree?