The vertical extension of the frame from the recesses at the top is found in two stamps:

• stamp 2
  (left recess, RHS);
• stamp 29
  (right recess, LHS);

The extension of the frame from the recesses at the top is found on:

• stamps 30 and 36
  from the LH recess, LH corner;
  
• stamps 1 (minor), 4, 5, 10, 21, 32 and 38
  from the RH recess, left corner;
• stamp 42:
  horizontal LH recess, left corner.

The extension of the frame from the recesses at the top is found on:

• stamps 30 and 36:
  from the LH recess, left corner;
  
• stamps 1 (minor), 4, 5, 10, 21, 32 and 38
  from the RH recess, left corner;
• stamp 42:
  horizontal LH recess, left corner.