The actual Yeoman model is three layers, while this one (more accurately called an Explorer when dressed in standard scales) becomes a BSA Yeoman because of the inlaid Fleur De Lis logo used by the Scouts.
There's lots more name fun to be had, so check out SAKWiki and read all about it! https://sakwiki.com/tiki-index.php?page=Explorer 
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When it comes to sorting out model names, Victorinox collectors have their work cut out for them- like when it comes to this Boy Scouts of America (BSA) Yeoman.