I have no connection but found this interesting. The back does have Ford script on it. No place for a key. Any ideas?
http://www.ebay.com/itm/Early-FORD-MODEL-T-Disconect-Switch-Ford-Script-for-Rest ore-/281378645301?pt=Vintage_Car_Truck_Parts_Accessories&hash=item4183796535&vxp =mtr
Likely Fordson tractor 1930's-50's
http://www.silverfoxtractorspares.com/fordson-tractor-ignitionlight-switch-narro w-body-11655-p.asp