(Possibly) Rare Othello Variant for Atari 2600?

[techy2600]

Today at a game store I found a possibly rare Othello cartridge for the 2600. Problem is, I cant find it on eBay or on Image Searches. I looked around to compare the cartridges and the "rare" one had the * for CBS replaced with a "TM".

Is this rare? If so I would like to know in the case that I could find a new variant, this might just be a 1986 liquidation cartridge, though. If anyone knows if this is rare please let me know.