Bradberry Classic 320

Grabow has used a variety of stem materials over the years. Most pipes made since 1981 have ABS plastic stems although some (mostly Royalton) have acrylic and some vulcanite. The acrylic stems are all brightly colored.They haven't used vulcanite from about the early 1990's. From the early 1930's up to mid 1980s 99% of Grabows had vulcanite stems. There's a few from the early 50's with a weird nylon/plastic. Willards used nylon if memory serves--except for the bent pipes which were vulcanite.ABS and the nylon will not oxidize.
To get a rusticated pipe to shine you need to get all of the built gunk that accumulates in those cracks and crannies out. Some guys like to use Simple Green. I take them to the sink and with the stem in place and the bowl facing down scrub them with a tooth brush and warm water and whatever soap happens to be handy. Let it dry overnight and wax it. I like to use Halcyon II and buff it with a clean shoe brush and finish with a micro fiber cloth.
Recently I discovered that a rotary horsehair brush works great for cleaning rusticated/blasted pipes--without soap and water. See this-- http://drgrabows.myfreeforum.org/about7284.html

Don't see many Bradberry pipes .Seems like those I have seen had screw in stems. Yours looks to be a billiard with a military type stem. Can't tell you anything about them--never researched them.