Description:Lot of (4) 1909-1915 Frank Navin autographed letters on Tigers stationery. Series of letters on "Detroit Base Ball Company" stationery with content related to Spring Training and/or Exhibition games and (1) regarding players. Two mention Hugh Jennings who was then Managing the Tigers. Each is signed in fountain pen rating 7 to 8/9 out of 10. Varying degrees of mild to moderate wear and toning. Includes auction LOA from JSA: GD-EX