This is the second time in my eight plus years selling records locally: Coming across a record for which I find nothing to compare it to. The first was a Woody Guthrie album that I eventually gave up on finding a value for, so I got in touch with Arlo Guthrie and donated the record to the Woody Guthrie Archives. That just seemed like the right and honorable sort of thing to do with that record. This time though, I am considering offering what I have to the California State Library in Sacramento at a reasonable price. But how do I place a value on a record for which there is nothing to compare it to? The closest I have been able to find in this, a two 7" 45RPM edition listed on Discogs thus: The Padre Choristers – Songs Of The California Missions (1959, Gatefold, Vinyl) What I have is a two 10" 78 RPM boxed set in mostly excellent condition with one small surface scratch on one of the 4 sides. The RCA catalog numbers and run-out matrix numbers are is RR-18148 through RR-18-18151 The cover looks the same of the 45RPM set but is more oblong and, of course, is larger and has liner notes inside both front and back covers. My goal is not to price gauge the state, but at the same time this appears to be a very scarce set and I don't want to short myself on the value of something so unusual. How do I put a value of such an item? Thoughts?