Slide marking mixed meaages

[hsr]

I have a type 4 slide. On the bottom inside of the box it has a faint double struct "PI" (Inland) on the outside bottom of the box it has a "U" with sarifs and no dots. Does this indicate an Underwood connection, either shipped to Underwood from Inland or the other way around, or does it mean something else. I want to sell it and I want my description to be accurate.

Thanks

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