For his 6-season major league career and over 241 innings, the lefty walked 218 batters while striking out just 113. In 1956 alone his stats would make any SABRmetrician cry: over 123 innings, he walked 112, striking out 49, and giving up 141 hits for a shocking 2.057 WHIP, a 3-12 record and an ERA of 6.44. Even for a bad, bad Senator team, that was bad.
Wiesler's Baseball-Reference page lists a single multi-player trade for his transactions after his initial signing by the Yankees, which sent him from the Yanks to Washington.
However, Wiesler's career continued until the 1961 season, and saw him go from the Senators to the Yankees system again, followed by the Twins and Angels in 1961.
He goes from the Senators to Richmond (Yankees system) in both 1957 and 1958, and I cannot find these deals anywhere. But he is certainly Yankees property again by 1959, as he is in spring training with the big club, sent to Richmond in an article from the News-Herald from Franklin, PA of April 2, 1959:
“The New York Yankees today returned first - baseman Frank Leja, shortstop Rod Kanehl and pitcher Bob Wiesler to their Richmond farm club in the International League.”
Wiesler stayed with Richmond until just before the 1961 season, when he headed back to the former original Senators, now the Twins, and their Syracuse AAA club. From the Progress-Index from Petersburg, Va of April 11, 1961:
“The Vees did some cutting yesterday, and among those sent away was veteran lefthander Bob Wiesler, who was sold to Syracuse. He has been with the Vees since 1957.”
"Vees" was short for Virginians, the Richmond team nickname.
Wiesler's return to the Senators/Twins system was short-lived, one two-inning, 3-walk, 5-hit, 4-earned-run performance. From the Syracuse Post-Standard of April 25, 1961:
“The Syracuse Chiefs began "Operation Shakeup'' yesterday by releasing Pitcher Bob Wiesler.”
Weisler finished the season at Dallas-Fort Worth, an Angels minor league team, but I could not find the signing date.
If anyone can fill in the blanks for Wiesler's moves between Richmond and Washington, let me know!
Wiesler photo stolen from http://www.tradingcarddb.com