Best Venue
Confirm the dimensions and inspect the back of the sign for any maker's marks or signs of true aging. If it is a modern 8x8 reproduction as suspected, it is best sold on eBay or Etsy as decorative memorabilia with a $45 Buy-It-Now price. If dimensions are large and the back shows authentic heavy steel and age, escalate to a specialist railroadiana auction house.
Upside Potential
If dimensions are confirmed to be large (e. g., 24 inches or more) and the back of the sign reveals heavy-gauge steel, authentic aging, or a vintage maker's mark (like Veribrite Signs), the item would be reclassified as an authentic mid-century original, shifting the valuation range into the $800 to $3,000+ tier.
Porcelain advertising signs are one of the most heavily reproduced categories in antiques. The pristine condition, lack of enamel 'shelving' (layered thickness typical of vintage porcelain), and the presence of clean brass grommets are classic indicators of a modern reproduction rather than an authentic mid-century railroad sign.