I have a pair of ship's instruments - an 8 Day Ships Bells clock and a matching barometer.
The glass front is fitted into the brass bezel with a white tube gasket. I approached the clock's maker in Denmark (or at least, the company that now owns the clock brand - it was made in Germany) and they advised as follows:
"This model we do not produce any longer.
However we use a pvc-white tube for the Schatz Midi and Royal series instruments.
This tube is ø2mm internal diameter and wall thickness 0,4mm."
Does anyone have any idea where I could obtain pvc tubing of that specification?
The problem is that over time (I estimate the clocks to be over 20 years old) the tubing has hardened and cannot be compressed to return to where it is supposed to sit, so part of it is 'out', obscuring the legibility of the clock and barometer in each case.