This Marlin manufactured 22" long barrel is for the Glenfield model 100G bolt action rimfire rifle and is in very good condition exhibiting a mixture of thinning original blue finish with a brown patina and having a few light dings and surface rust specks.  (file photos)

Firearms with the following year/serial number have been observed with this part: N.S.N. (HH) August 1964 & (KH) November 1964