David,
Yes, you have an "Automatic Ejecting" model - in fact a 2nd Model 4th Varition made between 1894 and '96. It is a blackpowder ONLY model. The actual Patent date stamping should be: Oct. 4, '87, May 14 & Aug 6, '89 The full serial number will be found under the top strap - you'll need to remove the cylinder to see it. Lift latch, push in small button on left side of top strap, let go of button - latch should stay in upward position - if not, push in button and lift latch - then release. Serial number should have a letter code prefix. Post that letter and I can tell you exact year of manufacture.