[TimCarrollArt]

Love it! Even cooler would be to know the exact date (to possibly tie it with the pitcher that threw it!)

I started looking......the Yankees played 18 games at home during the month of September, 1929. 6 double headers (ahhh, the good ole' days!). Checking the box scores at baseball-reference.com revealed the following pitchers that faced Gehrig in NY during that span (obviously no way to know the counts in the AB's, let alone which AB's contained a foul ball):

DETROIT TIGERS:
George Uhle
Ownie Carroll
Skinny Graham
Augie Prudhomme
Vic Sorrell
Emil Yde
Earl Whitehill
Phil Page

ST. LOUIS BROWNS:
General Crowder
Sam Gray
George Blaeholder
Jack Ogden

CLEVELAND INDIANS:
Ken Holloway
Willis Hudlin
Johnny Miljus
Jake Miller
Wes Ferrell
Milt Shoffner

CHICAGO WHITE SOX:
Hal McKain
Ted Lyons
Red Faber
Roy Sherid