Brand: Schwan Bleistift Fabrik
Made in: Germany
Finally got a Stabilotone 47 XXB otherwise known as a 20B. Gallery pictures show front and reverse of same pencil, the pencil with its cap, and lastly the Stabilotone next to a standard pencil for scale.
Many of the larger and well known European pencil companies opened up a franchise in the USA. For example, The House of Faber: A.W., Eberhard, & Johann. It appears that Schwan did the same, using the American spelling of Swan on its pencils manufactured in the U.S. as well as some made in Germany.