It appears as a potential anomaly or digit string in a 1976 Salt Lake Tribune newspaper archive search.
Based on your search request for "18785x", the initial results indicate that this specific string of characters may appear in OCR (Optical Character Recognition) data from historical newspaper archives.
Due to the nature of OCR technology, this could be a misinterpretation of text (like a price, part number, or date) that appeared on the original page.