Yes, there is a horizontal stroke for 7 which separates it from 1 for those writing that use long upstrokes for 1.
1 and 7 are very similar, it's important to distinguish the upward stroke of the 7 glyph from the long upward stroke in the glyph for 1
the number 7 is a great number. I can only say that its the number after 6 and before 8. I heard that 7 has various strokes that makes it look like other numbers?
This horizontal stroke is, however, important to distinguish the glyph for seven from the glyph for one in writings that use a long upstroke in the glyph for 1.