Yeah me too, the only time they ever shoot & killed people was the special when they went back to Vietnam, I think they were saving POWs or something. Plenty of “non Americans” died then lol.
God bless Murica 
Unless you were a window or a car head light you were pretty safe around them.
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I realise I’m replying to an old post but thought the info might be useful anyway - according to my Standard Catalogue of Winchester Firearms, The “Extra Long” stamping was added in 1914 and replaced with a “.22LR” stamping in 1927, so this rifle would have been made in that period between 1914 and 1927.
The proof marks Winchester used at the time don’t involve anything date specific so there’s basically no way to date the rifle more specifically, from what I understand.
Actually, the .22 Extra-long is a specific cartridge. The case is longer than .22LR and held 1 extra grain of blackpowder, 6gr, compared to the .22 Long cartridge which was loaded with only 5 gr of blackpowder. My references say the it was chambered in the Model 04 from 1916. It had the same velocity as a modern standard velocity .22 round. It will not chamber in a .22LR chamber but the .22LR will chamber in a .22 Extra-long chamber. You should never use modern Hyper-velocity .22 ammo in rifles chambered fo Extra-long.