[BigJJ]

T-206 sheets likely contained eight rows, though perhaps six - four identical rows, followed by a different four identical rows. In this manner, the same player appeared vertically four times in a row (Wagner on top of Wagner on top of Wagner on top of Wagner). We do not know if Wagner’s four rows were on the top of the eight row sheet, or the bottom. Based on the above, only one of every four Wagners was located either above or below a certain other player. At present, we do not know the identity of the player who neighbored Wagner vertically. One strong indicator that the number of identical rows was four, is that there are about 3-4 times as many vertical miscuts showing the same player on the card above/below as there are showing a different certain player (the other player is always the same in each series, though there may be exceptions to this). While we do not know who neighbored one of every four Wagners vertically, we do know who may have neighbored Wagner horizontally, to the right, Mordecai Brown (portrait), and to the left, Frank Bowerman; this is known from the only surviving arguable T-206 strip that contains a Wagner, it is pictured below. Based on the above, it is my belief that no card (other than a Wagner) is likely to exist in miscut form that contains either the top or bottom of a Wagner card. However, the right or left sides of a Wagner card may be found on certain Mordecai Brown (portrait) and Frank Bowerman cards respectively.
But only on a select few Brown (portrait) or Bowerman miscuts and misprints. Wagners are found only (i) in Sweet Caporal or Piedmont brands, (ii) with a factory stamp on the back stating production at Factory 25 in Virginia, and (iii) in the initial T-206 printing, indicated by “150 Subjects” printed on the back. Therefore, only Browns (portrait) or Bowermans that have Sweet Caporal or Piedmont, Factory 25 Virginia, and “150 Subjects” backs, possibly were next to Wagner.
Few such cards survive. And, far fewer survive miscut. And they must be miscut horizontally. and be miscut toward Wagner. and be greatly miscut for printing evidence of the adjacent card to be present.

Edited, per Steve below, to add that horizontal miscuts are more rare than vertical miscuts (not evenly split), and therefore finding an adjacent partial Wagner on either a Brown (Portrait) or Bowerman is actually even more elusive.

Edited, per Steve and Brian below, to add that Factory 30 Sweet Caporal Wagners have also been found.