@P Suckling, your theory is true. PHA 361 is the catalogue number of the IPK Gatersleben gene bank and this is probably the original source of the seeds of this bean. According to the description, a seed sample was obtained at an agricultural market in Krakow in 1941. Poland was under German occupation at that time, so I don't even want to imagine what collecting samples was like. The IPK Gtersleben collection contains more beans collected at the Krakow market at that time and I intend to order all the ones available.
Poles don't attach importance to giving beans specific names. Most often they are simply called yellow snap or green snap. Dry beans are called by color: white, black or red. Only commercial varieties introduced by horticultural companies have specific names. Similarly regional beans deeply rooted in tradition such as Piękny Jaś, Sidun, Piechota, Bomba or Malinka.
The beans whose seeds I obtained from the Polish gene bank were mostly unnamed. I gave them the names of the towns where the seeds were collected to distinguish them during various exchanges.