578 (2,018) Cambridge Surprise Minor

Donald F Morrison
 2345   F  W  B  H
 4523      -     -
 5324      2
(5243)  2  -  -
(3245)     s      
Rounds at the treble’s backstroke
snap two blows after the single.

Contains no backstroke 65s.
For a date touch of 2,018, call two extents followed by a 578.