I know these smaller plates were used primarily on the HH models though I have one 69207 August 1940 from a Reading S-1 My earliest 6x12 Alco GE plate is 69402 December 1940 from American Steel and Wire S-1 Question How bizarre would a 4x9 Alco (not Alco GE) plate from June 1942 be? sn 69810

I should add it is off an S-1 not steam