Question regarding Site and URL structure + Faceted Navigation (Endeca)

[danatanseo]

We are currently implementing the SEO module for Endeca faceted navigation. Our development team has proposed URLs to be structured in this way:

Main category example: https://www.pens.com/c/pens-and-writing/

As soon as a facet is selected, for example "blue ink" - The URL path would change to https://www.pens.com/m/pens-and-writing/blue-ink/_/Nvalue (the "N" value is a unique identifier generated by Endeca that determines what products from the catalog are served as a match for the selected facet and is the same every time that facet is selected, it is not unique per user).

My gut instinct says that this change from "/c/" to "/m/" might be very problematic in terms of search engines understanding that /m/pens-and-writing/blue-ink/ as part of the /c/pens-and-writing/ category.

Wouldn't this also potentially pose a problem for the flow of internal link equity?

Has anyone ever seen a successful implementation using this methodology?