This is a beautiful vintage Otto Link tenor mouthpiece. The model is “Four ****” not to be confused with the tip opening, which is a 5, measuring .074″. This piece has been played a lot and has very little of its original gold plate remaining. It’s pretty much bare brass. The bite plate has had extra material added back so that it is smooth again. This is probably still an original 5 facing in this case. (MasterLink facings seem to measure smaller than later models, where a later Link 5 would be more like .080″) This piece has a dark, wide tone with a large chamber and no baffle. What looks like an original ligature is also included.