As per my research and records found, no copy of Sports Illustrated was released on this date i.e. April 13, 1963. However, one was released early and one later. Both the copies in mint condition can be $20 to $30, you may check out from eBay and Amazon.
Whitey Ford appeared on a couple ofcovers of Sports Illustrated. The first time in 1956. A 1956 Sports Illustrated Whitey Ford cover issued on September 10 is worth about $25. in excellent to near/mint condition with no mailing label. The September 30, 1963 issue is worth about $10. As with all collectibles, condition is important. The slightest flaws will bring the price down significantly. An exceptional mint condition magazine could sell for more. Common flaws would include: staining, foxing (yellowing), fading, creases, rips, loose pages, cracked binding, writing on the cover, and mailing labels.
April 23, 1963 was a Tuesday.
April 10 1963 was a Wednesday.
April 3, 1963 was a Wednesday.
April 13 1963 was on a Saturday.
The 20th of April 1963 was a Saturday.
April 22 1963 was a Monday.
April 1th1 1963 was a Thursday.
April 3, 1963 was a Wednesday.
April 20th, 1963 fell on a Sunday.
April, 28th, 1963, was a Sunday.
April 27, 1963 fell on a Saturday.