I have wanted one of these for quite a while and last week the gods of eBay smiled upon me. The beader is essentially a mass produced scratch stock that puts profiles on wood. Stanley made them from 1886 to 1941. Because this one is jappaned, it was made before 1898. Handplane Central has some information here.
When shopping for them you want to look for one that preferably has its fence and set of 9 cutters. You can also make your own cutters with custom profiles. Both Lee Valley and Lie-Nielsen sell versions of this tool. You can also buy cutters from Lie-Nielsen or from St. James Bay Tool Company. This 66 only came with two replacement cutters. I will be looking to get a full set plus some blanks or steel to make my own.
Instructions for making your own fence and cutters can be found here.
Blood and gore info on the beader here.
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