that was considered the "long throw", off set ejector housing,the first ones were a "short throw" the notch was further up, and then set back to make the throw longer, till they finally went with the straight slot, needed for the 1955 addition of the 357 magnums and need the longer throw to completely eject the spent cartridge... even the shape of the rod itself changed over time, for caliber sizes, the holes in the frame , need to be "clear" , a round round NOT hitting the edge of the hole on a smaller diameter, this is usually explained in any of the, many Ruger books put out over time by various authors.....they then finally went to an aluminum housing, instead of the steel ones, all this was due to manufacturing changes, save time, lessen the steps needed in ,making any of the parts used in the making of the guns, time saving is a cost saving, nature of the beast...
these changes in building, caused the guns to fall into various stages of these "variations" thus the types evolved....same went for the ejector rods used, and the buttons that were attached at the end, the early serrated ones, were small, easy for the finger to slip off, so they made a button, rounded, with a dimple in the front for your finger tip, this too changed in time , saved a step and they made it 'flat'...and on and on it goes, types of variations, these changes will occur at the serial number ranges accepted by the collectors, ,again, mentioned in the books, and the current RENE (Red Eagle News Exchange) put out by Chad Hiddleson, here on the forum is chet15, and he covers any and all these changes, types, and serial number ranges , reported to him by various ( any and ALL ) collectors of Rugers , and he tries and keep an up to date listing of the serial numbers reported, and any changes in the range, from a low number to the higher, end of any "range"...good info put in print, as they say "get the books"
Hope this helps a little.................. and welcome to the Forum 8) :roll: :wink:
what they look like.......