What is This Gadget?

I was given a bunch of stuff in a box over the weekend and this particular item has me totally stumped.

I think it may be from an LPL/Saunders 6x7 enlarger (the rest was) but I’ve *never* seen it used on one in the 20 odd years that I’ve been using several models.

So my question to the Photrio Brains Trust is: What is it, and how is it used?



Edit: Updated the title to reflect a broader question.

It doesn't look like any LPL 6x7 accessories that I've seen, and I own quite a few. The masking glass negative carrier can take glassless inserts, but they are relatively thin (about 2 mm, maybe) the same thickness as the glass that they replace.

May be a focus screen for a copy camera conversion of an enlarger. Durst made various similar devices, like this URNOV.

N

ic-racer said:

May be a focus screen for a copy camera conversion of an enlarger. Durst made various similar devices, like this URNOV.
View attachment 187741

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Now that *is* interesting; I wouldn't have thought of that myself.

voceumana said:

It doesn't look like any LPL 6x7 accessories that I've seen, and I own quite a few. The masking glass negative carrier can take glassless inserts, but they are relatively thin (about 2 mm, maybe) the same thickness as the glass that they replace.

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Yes, I have two of those glass carriers myself. Maybe they dumped a totally unrelated part into the box.

Yeah, it could also be a critical focus device for a small plate camera.

Good point, Kino. Maybe they were just as stumped as me and that's why it ended up in a box of totally unrelated stuff!