I can't help, it. I'm going to be a bit long winded with this. If you don't want to be bothered with my narative, then skip down to the red highlited portion. I've been preparing for a move from Alaska to Hawaii. I've been going through my very small selection of firearms. I pulled out my old H&R Model 165 to look at it again. And once again, out of curiosity, I've gone looking for more info about it. You folks appear to be the most informed about the H&R Model 165 and its bretheren that I have ever run across. http://i131.photobucket.com/albums/p295/solo_voyager/DSC_0100_zpse5143bcd.jpg I've owned this rifle since I was 9 or 10. My father bought it new for me in 1952 or '53. He chose it because of the Model 65's Garand weight and dimensions, and its use by the USMC as a Garand trainer. He was a vet of WW II in Europe. It is also the heaviest. 22 rifle I have ever picked up. I'm always impressed as to how light and tinny other .22s feel. http://i131.photobucket.com/albums/p295/solo_voyager/DSC_0106_zps6076e83e.jpg The first thing he did to it, I believe, was to put a military sling onto it. It is possible that it came with that type of sling, but I don't think so. The second thing was to pull the peep aperture out and throw it away. I learned to shoot it looking through the opening the aperture screws into. I found a replacement aperture at Gun Parts back about 2000. I also picked up 9 more clips for it. I still prefer to shoot it without the aperture. The field of view is much better and it can be aimed just as accurately. http://i131.photobucket.com/albums/p295/solo_voyager/DSC_0107_zpsb9ced41b.jpg http://i131.photobucket.com/albums/p295/solo_voyager/DSC_0109_zps1593749e.jpg It proved to be a lot like an electric train for Christmas. I spent more time watching him shoot it than shooting it myself. But, I did spend a lot of time with it off by myself out in the woods and old strip mines, coming home with my pockets full of squirel and chipmunk tails. Over the years, I have probaly done some things to it that detract from its "collector" value. For a number of years it had been out of my posession and had been stored poorly. It had some rust spots on the barrel and receiver. The stock had a crack in it and it was very dinged up. The sling had mildew stains on it. I sanded the pits out of the barrel and receiver and re-blued them, refinished the stock, replaced the sling swivels with a quick release type and put a newer military sling on it. When I picked up the peep aperture and extra clips, I also ordered what GP called a replacement stock for it. It was bigger and did not fit the 165 receiver and barrel. To fit the 165 it would have required some carving and filling. In the end it would not have looked like a 165. I eventually threw it out. Collector value is of no importance to me, because I have no intention of ever selling it, even though I do occasionally try to look up its value. What started my perusing for information about it this time, bringing me here, is trying to find out about serial numbering on the Model 165. Mine has a S/N of 7727. I am curious if its date of manufacture can be found out or estimated? I don't think I'll get much satisfaction though. The feeling that I have come up with is that either H&R never kept those records, or they have become lost since H&R closed down.