IOS optics large metallic ND filter 1.0? beam splitter #41B

Description

Nice 4 1/4" X 3 1/4" X 1/4" thick rectangular metallic ND filter / beam splitter made by IOS Optics, a supplier for major brands such as Continuum, Melles Griot etc.
Usable metallic area is actually 4" x 3 1/4" due to substrate is larger than coated area.
I'm guessing it could be an ND 1.0
Looks about a 60/40 split by eye.with 488nm,532nm, and 635nm. If you need to know the exact ratio for a given wavelength, let me know and I'll take measurements.
See my other auctions for more IOS optics.
I combine ship as well,