Hi.
I have the
7 shot version with the factory gold plated front sight like this one:
http://www.theshootersbox.com/hr_22special_pictures.htm
Mine is S/N 514xxx
I was gifted this gun, and it is in very very nice shape and is so accurate!
Using old Numrich catalogs, I was able to find parts, and information.
Just confusing as all get out.
I would contact Numrich, and even go so far to make a scan to size /copy to size and use this to assist them.
Information is hard to come by, it seems H&R and record keeping, is "difficult".
Rumors are, a book is in fact in works to assist with S/N , models and the like.
I have received some information, with the assistance of some nice Folks
like Old Fuff, Jim Keenan, still the information is "sketchy".
Best I can nail down, mine was made between 1925 and 1941.
I was born in 1955 and had an exact gun, like the one I was gifted.
Mine is a sentimental shooter...just still looking for more information myself.
I have not taken the time to run down anymore information, so thanks for posting this thread, and perhaps we both (and others) will learn some things.
Steve