Rare July 4 1974 REPUBLIC FUN DAY Pinback Button Vintage Antique Pin Michigan

Extremely hard to find vintage 1974 pin advertising “Republic Fun Day ‘74” in the town of Republic Michigan (for non-yoopers, it’s a tiny little city 51 miles northwest of Marquette in the upper peninsula). Text on rim of button reads “Northern Specialty Co., Republic Mich.” Measures roughly 1.75” in diameter, and has ample rust on the back & staining on the front (I don’t know what the brown stains are from. Yes- it’s permanent; No- it’s not something that can be cleaned off). Sold as pictured.