Yes I did notice it, and I actually spent quite some time looking for it in the picture
Is it the coin bottom left of the one in the 2x2? They are relatively common because they were the lowest denomination silver coin. There were two designs, the commonwealth one until the late 1930s (can’t remember the year they changed), and the second one with wheat stalks (which we sometimes call wheaties). There were also two different silver percentages, the .925s were stopped in 1944 and replaced by 50% silvers. Which year is yours?