Anyone know what this adapter does?

[Simply_Dave]

Going through my old Colecovision stuff today and found this adapter packed in with my expansion module 1, however I'm not quite sure what it is or what it does? I don't think it came with the original package? Thanks in advance if anyone knows.

 

http://imgur.com/a/EHTq3

[mumbai]

That's the cartridge adaptor Coleco supplied through the mail to enable a wider variety of (third-party) Atari 2600 cartridges to slot into the expansion module. Not a common find.

[Simply_Dave]

That's a huge help. Thanks for your expertise. I appreciate it.

 

Dave

[JustinMSalvato]

Learned something new today. Never seen that before.