Vintage military power supply vibratory no 12 MK.2 used for military radios as far as I understand. FOR PARTS OR REPAIR ONLY as it is untested by me Quick Google research suggests that this item is made by larkspur but I can't find brand name anywhere on it. In well used but not abused condition. I don't have any cables for it. Please study attached photos for more details. I have couple other military related blocks listed too. Please check my other listings.
