Vintage Pinhole Lens & Shutter Solid Brass for Antique Camera circa 1900?

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Vintage Pinhole Lens & Shutter Solid Brass for Antique Camera circa 1900?:
$89.00

Interesting pinhole lens/shutter. Four very precisely labeled graduated holes rotate into place, showing #4 at 0.375, #3 at 0.50, #2 at 0.75, #1 (no hole), and #0 (the largest). In front of those holes is a rotating disc with 6 large machined holes of equal size.A rotating plate covers both of these, with one large hole for an open/shut setting, moved with a small knob. All in a square hosing 2\" square. Back has threads for mounting ring, but there are also holes in the four corners where screws could secure this to a camera or lens board. All in solid brass, likely made circa 1900. A very unusual piece! Any furhter information is welcome. Satisfaction guaranteed.No sales or shipments to Mainland China.