This is a sub-sign used on the Kamikochi Line 20100 series. It was attached to the driver's side of the cab and used during operation. It's a simple laminated sign, but the design is elaborate, with the shape of the Tobu Railway Ryomo-go headmark as its inspiration. I don't think these are often available, so please consider purchasing one. Please note that it is also being sold elsewhere, so be sure to comment before purchasing. We are not responsible if you purchase without commenting and it is sold out.