Pete, Thank you once again for both taking an interest and your constructive comments. Right from post one I been trying, unsuccessfully, to upload 'photos of this instrument even though my uploads are within the 104.4 KB limit. This sax is indeed stripped down and ready to be worked on. The 'photos would have revealed this and also the present, rather scabby, state of the inner bell.
I think your advice regarding the DIY approach is a sound one and it's occurred to me that a
highly polished bell mouth could look over restored and not in keeping with the rest of the 80 year old horn. I'll go down to Tescos in the morning and shoplift a tin of Duraglit.
I'm just trying to do the best for a very beautiful old saxophone that has had a very interesting spiritual life, including being played at the Ritz in 1952, and will almost certainly be around long after I'm dust.
As you will know, these old Martins are superb players and I very much regret selling
my Lewin Bros tenor that came out of the factory about the same time as this one.