Greetings. I have spent the last few hours searching the Internet for an approximate date of manufacture for my rifle. The barrel is stamped" Winchester Model 70 270 win. Made in new haven, CT USA. Classic Stainless" with a serial # of G314***. I have found a wealth of information on the Internet but I can't find any info pertaining to the day of the model 70 with serial numbers G31****. If any of you have info on the date or can point me to the right post or page or book, I would greatly appreciate it.