Determining Cost Basis of Hobby Collectibles Acquired More Than 6 Decades Ago - No Records Kept

More than 60 years ago I purchased US coins from a retail store. In addition to retail price for my purchases, I also paid applicable state sales tax. During the time of my purchases (over several years) I was an avid hobbiest adolescent coin collector. I loved coin collecting (purchases as well as finding coins of interest to me in circulation) and my keen interest in this past-time as a youngster lasted for several years until my interests shifted to other activities. I never kept any records of what I paid for the coins I purchased nor the dates on which I bought them. I never gave any thought to acquiring them as a money-making hobby. I am now trying to file my 1040 Income Tax for last year (2022) when I sold some of the coins. I want to file an accurate and honest return. Can anyone out there in TurboTax Land provide information to help me answer the question I am trying to properly address and to enhance my knowledge base?