This is a vintage Stromberg Carlson XY Switch Tester. The unit has not been tested it is sold AS-IS FOR PARTS OR REPAIR. We have no way to test this unit.  The wooden box is in bad shape all of the varnish is flaking off and it is seperating in parts. The diagram that should be in the top of the case is missing. We have done nothing to the unit other than try to wipe the worst of the dust and spider webs off. On the bright side there were no mud dauber nests in the box.

Please look closely at the pics the unit you see is the one you will receive