Just took a close look, there's heavy cake buildup inside the bowl and some significant oxidation on the stem. These seem to be the main issues for restoration.
Removing cake and removing oxidation are both things that you can do yourself if you don't want to send it out.
To remove cake I use a Pipnet to start and then finish with glass paper wrapped around a Pilot marker or just wrapped around my finger. If you have the gear, buy yourself a piece of wood doweling smaller than the width of the caked up chamber, file round one end, wrap it with glass paper held in place with a rubber band and carefully gently sand down the cake. Take care not to sand the rim of the pipe.
Scrub out the airway with a nylon shank brush dipped in alcohol and keep cleaning the shank brush as you go. Take care to avoid getting alcohol on the stained exterior. Get yourself some B J Long tapered bristle pipe cleaners, dip them in in alcohol, to further extract gunk from the shank airway.
To clean the stem airway I would get some White Elephant brand bristle pipe cleaners. The bristles are a bit softer than the B J Long pipe cleaners, so they won't score the Vulcanite. Also, the White Elephant brand pipe cleaners have a far more robust wire core, so they won't bend and collapse like the B J Long pipe cleaners.
To clean out the mortise, double over a tapered B J Long bristle pipe cleaner twice so that if forms a wad, twist it into the mortise and twist it around and around to loosen up the crud in the mortise. Use as many wads as necessary to get the mortise clean. Some people use dental tools to scrape the crud out of the corners.
If the stem is only slightly "oxidized" you can try toothpaste with a cloth to remove it. If that doesn't do the job, get yourself a set of Micromesh pads and sand down the surface under running water, starting with a coarser grade to remove oxidation and working to the finer grades, which will polish the Vulcanite to a high gloss. Again, work gently so as not to soften the line of the stem and button.
