Boston Bought a Proven Guard
During October 1948, the Boston Celtics purchased Jim Seminoff's player rights from the Chicago Stags for cash. Basketball-Reference lists the transaction on Boston's, Chicago's and the league's 1948-49 transaction pages with the day unspecified. That evidence supersedes the legacy July 1 date previously stored as an approximate intake placeholder. Seminoff had been a regular for Chicago in the first two BAA seasons, appearing in 108 games and averaging 6.8 points for the Stags.
Seminoff Gave the Celtics Two Full Seasons
Seminoff became one of Boston's more durable backcourt contributors immediately. He played 58 of the Celtics' 60 games in 1948-49, averaged 7.9 points and a team-high 3.9 assists, and produced 5.4 win shares. Boston finished only 25-35, so the acquisition did not transform the club into a contender, but Seminoff gave the roster reliable ball movement and availability. He returned for 65 games in 1949-50, averaging 4.8 points and 3.8 assists.
Chicago Took Cash and Kept Winning
Chicago received cash, but the amount is not disclosed in the transaction logs used for this review. The Stags were able to absorb Seminoff's departure. They improved to 38-22 in 1948-49 and remained one of the BAA's stronger teams, so selling him did not create an obvious roster crisis. That context keeps Chicago's grade respectable.
The 123-Game Return Gives Boston the Edge
Seminoff was not a star in Boston, but he was exactly the kind of rotation player whose value accumulates through availability and role. He played nearly every game in his first Celtics season, led the team in assists per game and stayed for a second full year. Chicago remained competitive, which shows the Stags did not need him to sustain success, but the sale still moved 123 games of future Celtics service for an undisclosed financial return.
Final Verdict
Celtics Win — Boston A-, Chicago B. Boston acquired Jim Seminoff from the Chicago Stags for cash during October 1948. The exact day is not preserved in the reviewed transaction logs, replacing a legacy July 1 placeholder that had been used only for chronological intake. Seminoff became a durable Celtics rotation guard, averaging 7.9 points and 3.9 assists in 58 games in 1948-49, then 4.8 points and 3.8 assists across 65 games in 1949-50. Chicago's cash return is undisclosed.