This is a very early vintage Otto Link "Master Link" Alto Sax mouthpiece serial number C95. These were the first mouthpieces that Otto Link made. This one has a very common 3 facing. These are generally seen in relatively closed facings. The largest we have ever seen is a 5. These very vintage links also featured a ligature that is very comparable to the Lawton ligs. They slide onto a ridge on the side of the mouthpiece, just under the table.