Gainsborough locks are commonly found in new houses. You may notice that the pin spacings on this bump key are not quite even. There are 5 peaks on this key. The 3rd one is an odd trapezoidal shape. That is because on Gainsborough locks, the distance between the 2nd and 3rd pin from the front is elongated. This does not affect bumping performance in the slightest.
x1 Gainsborough TE2
Bonus: 2x round dampeners