Well the cover of All 6s & 7s has the roman numeral for 67 on it. So i dont whether its 6s & 7s, 6/7, 6 or 7, 6 7, or 67 matters at all. That's petty criticism. Just like my ex. Just lookin for things that dont matter at all.
Having said that, i dont really like the tat itself or the location. Additions of the snake and bat could change my opinion tho.
looks like you got the number sixty seven. Not six and seven.