1970 – Experimental, lively X-5 baseballs are used in all spring training games played in Arizona and Florida. The results are inconclusive.
On March 11, 1970 — 1970 – Experimental, lively X-5 baseballs are used in all spring training games played in Arizona and Florida. The results are inconclusive.
Sources –
Baseball Reference March 11
SABR Games Project
National Pastime March 11
Retro Sheet
Replay The Game