This early 1900's tetsubin was made my the famous Long Wen Tang studio. The workmanship is good and the inside is in good condition - some slight rusting covered with a slight mineral patina.
There is silver inlay of a crescent moon, stars and birds on the handle and the lid is topped by a silver coloured knob (not sure which metal this is).
I've cleaned this tetsubin and used it for several weeks. The water quality is good - thick and sweet.
I'd be happy to own this tetsubin myself.