The slots milled in the front of your frame --
73542 01 Moran & Wolfersperger Ejectors on Quality GH.jpg
and the pin --
73542 01a pin at the knuckle.jpg
look to be typical Moran & Wolfersberger.
However, your ejector hammers in the forearm iron look different than the other M & W ejectors I've recorded.
73542 02a.jpg
Wonder if the difference is a time period thing as to when they were done?