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Seeing that fancy 'etched goldwash' still in existence is extraordinary.
No abrasive stuff. A pencil-point on the rust. Clean and Oil.......
In a display case.....ventilation is key.
Do a forum...

The value is what you paid for it. I would call it pre-WWII.
Schulze Razors are quite fine, IMO.

That hue of Celluloid might be susceptible to off-gassing.
Minimally, clean the blade with WD40...