According to British boxing historian Barry Wells, Stone claimed the world welterweight championship between 1914 and 1916, but the title was not sanctioned by a global body, as it would be later.

Before a modest crowd of 2000, Stone lost any claim to the world welterweight title on March 1, 1916 to fellow Jewish boxer, London-born Brit Ted "Kid" Lewis, in a twenty-round one-sided thriller in New Orleans.
The fight was fast and furious with few pauses in the action, and both boxers were considered to be in relatively good condition at the end.
 Lewis was described as the aggressor throughout the match, and considered by most sources to have clearly been the better boxer.
 The victor won fifteen and as many as eighteen rounds of the battle and Stone avoided being knocked out several times only by the use of skillful ducking and side-stepping.
 In the six rounds credited to Stone, the New York boxer blocked Lewis's blows and briefly appeared ready to assume the offensive.
Lewis, who had a very slight advantage of three pounds in weight and even slighter advantage in height, did not appear to be in danger in any time during the fight.
Lasting through the bout, Lewis was at his best in the last four rounds, which weighed heavily in the judges's decision.
 As  testament, to the validity of Stone's world welterweight title claim, Lewis laid claim to the title after his victory over Stone, but many felt Briton or other welterweights had an equally valid claim to the title.
The referees officially gave Lewis eleven rounds, Stone six, and declared three even.
Lewis would later be rated by the statistical boxing website Boxrec as the seventeenth best welterweight of all time.
According to British boxing historian Barry Wells, Stone claimed the world welterweight championship between 1914 and 1916, but the title was not sanctioned by a global body, as it would be later.
Before a modest crowd of 2000, Stone lost any claim to the world welterweight title on March 1, 1916 to fellow Jewish boxer, London-born Brit Ted "Kid" Lewis, in a twenty-round one-sided thriller in New Orleans. The fight was fast and furious with few pauses in the action, and both boxers were considered to be in relatively good condition at the end.  Lewis was described as the aggressor throughout the match, and considered by most sources to have clearly been the better boxer.  The victor won fifteen and as many as eighteen rounds of the battle and Stone avoided being knocked out several times only by the use of skillful ducking and side-stepping.  In the six rounds credited to Stone, the New York boxer blocked Lewis's blows and briefly appeared ready to assume the offensive. Lewis, who had a very slight advantage of three pounds in weight and even slighter advantage in height, did not appear to be in danger in any time during the fight. Lasting through the bout, Lewis was at his best in the last four rounds, which weighed heavily in the judges's decision.  As  testament, to the validity of Stone's world welterweight title claim, Lewis laid claim to the title after his victory over Stone, but many felt Briton or other welterweights had an equally valid claim to the title. The referees officially gave Lewis eleven rounds, Stone six, and declared three even. Lewis would later be rated by the statistical boxing website Boxrec as the seventeenth best welterweight of all time.
Harry Stone (boxer)