That's a V1 (Version) Silvia, which is a great single boiler/double use machine. Simple/solid workhorse that can give you great espresso, just have to dial in the temperature/pressure with a bit of experimenting. I've had one for a little over 3 yrs and have cranked out around 6,000 doubles with it. Not long ago I replaced quite a few parts in it... not from failure, just preventive maintenance as I use it quite a bit. Get it dialed in with a capable grinder, FRESH coffee, balanced water and some time/effort/patience and it will return the favor in spades.
Will likely benefit from a descale process as well as backflushing. I do highly recommend not using the stock basket(s) as they are a joke. The updated Rancilio 18 gram basket really brings it to life. Also toss that lame plastic joke of a tamper. You don't need to spend much as I've used a fantastic solid stainless 58.0 mm tamper I got on Amazon for $20.