One of the rarest baseballs of all time as this experimental type was used for 1 single spring training game in 1973. The owner of the Oakland A's, Charles Finley had this neat idea for this ball to be used in night games and shadowed times as well so the hitters could see the ball more clearly and fielders could track the ball better. It was given the go ahead by then major league baseball commissioner Bowie Kuhn. The game took place on March 29 in Mesa Arizona. That was the last time one of these orange coloured spheres flew in a major league game but they remain a sought after collectible.
This example resides in an almost perfect box, having never been opened to see the light of day since 1973. Very hard to find these type in mint condition and a mint box so adding this special one to a baseball collection would be a welcomed addition. You will not find a finer Finley ball anywhere.