Parker 51 Pencil with Rolled Silver cap.
This Parker 51 pencil is in totally mint, probably unused condition. Dating from the 1950s, it has a rolled Silver cap, the most sought after of all the English 51 caps. The eraser appears unused.
The pencil is the 'rotary' design, it operates by turning the cap to propel and retract the lead. This particular design was introduced, in England in the mid 1950s.
The Parker box is also in excellent condition, it may well be the original, it is certainly from the right period.