This is an antique cast bronze octagonal electric push button doorbell in the "Plymouth" design by Lockwood Mfg. and shown in their 1914 catalog. The doorbell has been cleaned of many layers of paint. This doorbell has been restored to working condition with a new doorbell button and new electric contact pad. Please see photos for details.   Although the first doorbells were mechanical, activated by pulling a cord, modern doorbells are generally electric.