German camera- need some help

My daughter just received several cameras from a close family friend and we’re trying to research them. The one that we’re looking at currently is a rolleiflex sn 2021162. Just trying to get some information about it.

Just going by the serial number, you probably have a Rolleiflex 4x4 "Baby", which uses 127 roll film. The negative size is 4x4cm, versus a standard Rolleiflex which is 6x6cm.
Likely produced during the early '60's.