What's the difference between the 2 six-switches?

[Eduardo]

From the 2600 F.A.Q.:

 

All 6 switch Ataris had a large shield casing. There were at least two 6-switch versions:

 

(6-1) The original. The entire bottom half of the console was made of quarter inch thick plastic (~6mm)! Combined with the thick aluminum RF casing, this is the heaviest 2600 ever made. Also, this 2600 has no 2/3 channel select switch. There is a channel select hole in the case and it's marked Channel A/B, but there's no switch inside on the PCB. These consoles came with "01 combat". (1977 models only)

 

(6-2) The lighter 2600. No armor plating. Bottom half of console is made of thin plastic, like the 4 switch models. Channel switch now present. Thick RF shield still present. Plain ol' "combat" included.

[Krytol]

I got the heavy sixer. Cool.

[Krytol]

I picked up a six-switcher at Savers this morning. Which one is it? How do you tell them apart?

[atari70s]

Email me the serial number that would help me in telling

 

braves4515@aol.com

[Atarian7]

My sixer has the a/b select. I thought there was a switch deep in there though. The label got cleaned off when I cleaned the system, but there is a "460" imprinted on the plastic right behind where the label would be. Does that mean anything?

[1090]

my atari isn't that heavy. I saw it and thought it was a heavy sixer, but it's pretty light. the SN is 386862