It looks just like the stool that came with the cabinet that came with my 301A. However, yours has the dark finish and mine has the blond finish. (I prefer yours!) Here is the picture of my cabinet and stool that the seller put in the ad. Although it is hard to tell by the picture, there is naugahyde on the edge of my stool but it is a tan color rather than black like yours. The lady had re-covered the lid part in a red fabric.
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The cabinet I bought is a No. 65 cabinet. It could house these machines:[h=3]15-90's. 15-91's, 66-16's, 201-2's, 201-3's and 301-1's[/h]The ISMACS site shows a slightly different stool with the 65 cabinet than what came with mine. The site shows that the stool has a bit of a cutout at the bottom of both sides where it meets the floor. My stool does not have those cutouts but I clearly bought it along with the #65 cabinet.
The No. 42 cabinet shows a stool that more closely resembles the stool you and I have. The #42 cabinet could house these machines:
[h=3]15-90's, 15-91's, 201-2's and 301-1's[/h]So, maybe I do have a No. 42 stool with a No. 46 cabinet?
In any case, I like your stool alot.