X is the date code for 1990. At that time most, if not all, Buck slip joints were made by the large U.S. knife manufacturer Camillus. Traditionally most of the U.S. knife manufacturers made batches of knives for each other without publicizing it.
I like carrying the largest Stockman that Buck sold in a standard Trapper pouch. They were 4 1/4" closed. All of them were made by Camillus. Unfortunately I did not buy a Buck branded one before Camillus went out of business. I did not want to pay what the Bucks sell for so my pair are branded Remington and Camillus. My Camillus has the same stainless blades as the Bucks. The one I use the most is branded Remington and has 1095 carbon steel blades. I watched one sell on eBay that was assembled with stainless blades stamped Buck, the green Delrin used on Remingtons and a Camillus side medallion. A collector paid a high price for it. Camillus used union labor to assemble good working knives that held an edge well.
Edit to add: I call Buck 110s and 112s rocker locks or back locks, not slip joints. 110s and 112s have always been made my Buck themselves.
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