The latest Ruth book is a revisit of the first two books along with some clarifications and corrections of them. I don't recall seeing anything about Winchester bayonet lugs being in there. All of the info I've added in this thread has come from online searches or a Carbine Club newsletter I have. However, one thing you'll find in there is the day your Winchester receiver was stamped. It may not be an exact date, but will give you a pretty accurate time range for it.
It definitely looks like your front sight is good, especially if Brian says it is. I thought it might be, but wasn't 100 percent sure.
Again, great Winchester!