well I never actually counted the marks until just now lol. I count 42 marks on the front, Mr Foxx hit HR #42 on September 8 1933 at Cleveland Stadium VS the Indians. Then little Johnny put his card away and forgot about it. Unless you count the two marks on the reverse, as Mr Foxx hit two HRs the very next day and totaled 48HRS for the season.
Of course I don't know what the previous owner was tallying up on the front, but you never know
Larry