Dust cover? Working? Cartridge?
Cleaned up and with a nice cartridge that is a 1000 turntable.
The SME appears to be the Series II (not improved) which is one of the desirable ones. Dust cover with hinges are a c-note and a half or more. The table is 200-450, depending.
That one could benefit from a serious service, cleaning, recapping, bearing polish and lube, maybe a thrust plate. Same for the arm, serious disassembly (not hard) cleaning and cartridge mounting and realignment of it all and you have a true classic turntable that will run for decades more.
In the condition shown, 4-500.
Welcome to AK.