The key of the sax varies from the type of sax. I know for sure the alto is in Eb.
Selmer Mark VI Tenor Saxophone
To buy a Selmer tenor saxophone one might want to look at an antique shop or one must look in the junk mail or on the second hand online market for the saxophone.
The Selmer saxophone with the serial number 19455 was manufactured in approximately 1947. Selmer's serial number system allows for a rough estimation of production dates, and this particular number falls within the range associated with that year.
Selmer Super Balanced Action
Gold plated (18k) Selmer Mark VI alto saxophone #70,xxx
The best kinds of sax are,Jupiter,Yamaha,and Selmer. These are in my opinion.
The brand and make of saxophone that is the most popular with professional saxophonists is the Selmer Paris Professional Model 52JS Alto Saxophone. This saxophone features a silk plater horn and neck.
To determine the age of your tenor saxophone with the serial number B02227, you would typically need to know the specific brand and model, as well as the production year associated with that serial number. If it is a copy of a Selmer saxophone, it may have been produced by a manufacturer that mimics Selmer's designs, which could vary in production years. Generally, many saxophones were made in the mid to late 20th century, so it's likely your saxophone is from that era. Checking with a saxophone expert or the manufacturer's records could provide more precise information.
It had to have been made between 1975 and 1980.
In my opinion the best known model of alto saxophone is a Selmer Mark VI. Most people consider Selmer to be of the highest quality. However, it all depends on personal preference and what kind of mouth piece, ligature and reed you are using. Other great brands are Cannonball and Yanagisawa. If you are saxophone shopping be sure to try out the actual saxophone that you are interested in because a brand can mean nothing if you're not comfortable on it.
Selmer Mk VI - 1957
Selmer Paris Mark VI Alto Saxophone