After the war Furukawa returned to the Nagoya team which was now going by the name the Chubu Nippon Dragons in 1946 and then the Chunichi Dragons in 1947 before moving on to the Hankyu Braves in 1948 where he played the remainder of his career. He stole 56 bases in 1950 which was the second most in the Pacific League that year behind Tadasuka Kiduka of the Nankai Hawks. He got seven hits in a game against the Hawks on August 30th, 1953 which is an NPB record. He retired after the 1959 season and later wrote a horse racing column (if I'm understanding the Google translation of his Japanese Wikipedia page, I think he married the daughter of a famous Japanese horse trainer named Katsuyoshi Ito).
There's around 20 or so catalogued cards of Furukawa from his playing days, most of which are either bromide or Karuta cards. There appears to only be one modern card of him - it's in the Dragons 70th Anniversary set that BBM put out in 2006. I only have two total cards of him - a bromide card from the set catalogued as JBR 73 which came out in 1946 and is one of the earliest catalogued sets for professional baseball in Japan and the BBM card:
|1946 JBR 73|
|2006 BBM Dragons 70th Anniversary #11|