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I also have the 203 in addition to the 204 and yes the older one does have the scissor slot.
I'm wondering if that scissors slot may have been a later addition. Because the one I looked at recently didn't have a scissors slot. At least I didnt see one anyway.
Also I don't remember but I don't believe that the 203 had the set up to put the 2 stones side by side in order to be able to sharpen straight razors and other tools that need that set up like the 204 unit.
Hey I'm not at all knocking the 203. But with all the improvements of the 204 I just personally wouldn't have much use for one. They were great in their day and they are still better than many of the junk sharpeners on the market. But the 204 was a vast improvement over it's predecessor.
I bought my 203 about 2 years before the 204 cAME Out so it is a later model I guess. It has only one groove on top.