@trubka2. OK I will chime in. Firstly it is highly likely you have the 19th century answer to 'Philt Pad' at the bottom of the pipe in which case it will either be a silver Three Penny Piece, button or some home brewed up washer configuration from yesteryear. Sometimes the better quality French meerschaums used to come with a removable meerschaum plug for the bowl to enable coloring. As I have remarked before you used to be able to buy for a Farthing (1/4p of a penny) a small china stopper for the base of a clay pipe to keep the crud out of the stem and enable a cooler smoke or so the theory went. If you are feeling courageous scrape around the blob to see if you are looking at a home brewed coloring bowl. If that is the case it will have holes in whatever it is. Scrape the chamber flush with the top of the obstruction and then insert a cork screw into one of the holes of the coin/button and pull gently and see if it moves. The trick is to scrape all the crud off the chamber so that whatever it is can be pulled out without ruining the chamber. If in doubt then send it off to Briarville.
With regard to spacers the paper washers used on stationary work a treat as well will any thick cardboard similar to that used to form match booklets. Again, punch a hole and then add as many as required to square up the pipe stem and bowl and then trim the surplus away using a razor blade. If the threading on the shank is buggered due to some idiot it becomes necessary to cement the bone tenion into position which is a lot more preferable to a snapped amber stem. Again removing these items from an amber stem is best left to an expert since you will be up against a 100+ years of accumulated pipe crud that will have set as hard as concrete.
In answer to your question about the case lining. That is fairly common with French meerschaum pipes. I have seen pipes that have been stored in damp conditions and the dye used on the silk has leeched onto the pipe. In your case that has not happened so count yourself very lucky.
I have a couple of this manufacturers 'cutty' pipes and they are well made and I have found the quality is often superior to the pipes manufactured in Vienna during the same period. At the end of the day it's really an instrument for smoking tobacco with but the esthetics do play a part in the smoking experience. I hope you enjoy your pipe.