Extremely rare battery holder for sony WM-F200 and WM-F202 Genuine part no. X-3329-691-1 Holds 1.2V Gumstick battery https://www.ebay.co.uk/itm/27432150...IT&_trksid=p3984.m1555.l2649&autorefresh=true I have a few similar items and would happily swap for a battery holder for WM-101
