MICROPHONE Type RS 39 TELEPHONICS CORPORATION NEW YORK N. Serial 509 or 11509 (unclear as 1s don't look like 1s) Pat. Don't know much about this or condition; I can't find any google info on it - RS38 is a US NAVY item. The "Jack" plug on it is 2 inner and 1 outer and the sort used on US equipment.
It looks like it has never been fiddled with. From the Collection of BobsDadsBits.
See my other items - Valves, Resistors & Capacitors. This item is in the category "Collectables\Militaria\Surplus/ Equipment\Field Gear".The seller is "oddacre" and is located in this country: GB. This item can be shipped to United Kingdom, Austria, Belgium, Bulgaria, Republic of Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Australia, United States, Bahrain, Canada, Japan, New Zealand, Hong Kong, Norway, Indonesia, Malaysia, Singapore, South Korea, Switzerland, Taiwan, Bangladesh, Belize, Bermuda, Bolivia, Barbados, Brunei Darussalam, Cayman Islands, Dominica, Egypt, Guernsey, Gibraltar, Guadeloupe, Grenada, French Guiana, Iceland, Jersey, Jordan, Cambodia, Saint Kitts-Nevis, Saint Lucia, Liechtenstein, Sri Lanka, Macau, Monaco, Maldives, Montserrat, Martinique, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Turks and Caicos Islands, Aruba, Saudi Arabia, South Africa, United Arab Emirates, Chile, Bahamas, Colombia, Costa Rica, Guatemala, Honduras, Jamaica, Kuwait, Panama, Philippines, Qatar, El Salvador, Trinidad and Tobago.