This is an electron tube with a bakelite 8-pin octal base.
Manufacturer
RCA
Place Manufactured
U.S.
Identifying Numbers
3-17
Printed in white ink around the base of the tube.
Model number
6AS7G
Printed in gray ink on the circumference of the envelope.
Other number
JAN CRC-6AS7-G
Printed in white ink in two lines around the base of the tube.
Other number
S 1768 C
Printed around the base in white ink inside a square that contains a large letter 'A'; the '1768' is below the horizontal bar of the 'A' and the other two letters are outside the top of the 'A' but inside the square.