Authenticity and Provenance:
The authenticity of the autograph is crucial. An authentic John Lennon autograph would have a Certificate of Authenticity (COA) from a reputable authentication service or source that verifies its legitimacy. The provenance or history of the autograph adds value if it can be traced back to the original source or owner.
Condition:
The overall condition of the vinyl record and the autograph is important. A well-preserved album with a clean and legible autograph will hold higher value than one that shows signs of wear, damage, or fading.
Rarity:
Autographs from specific periods or events in an artist's life can be rare and more valuable. Autographs from Lennon's early solo career, such as the period during the release of the "Plastic Ono Band" album in 1970, may have increased rarity.
Market Demand:
The market demand for John Lennon memorabilia and autographs can impact the value. Lennon is considered a highly influential musician, and autographed items related to his solo career are actively sought after by collectors.
Recent Sales and Trends:
Recent auction results and market trends can provide insights into the current value range of John Lennon's autographed vinyl albums. Websites like eBay and specialized auction houses may list similar items and provide sold prices for reference.
Estimated Value Range:
Based on the above factors and assuming the autograph is authentic and in good condition, the estimated value of an original John Lennon autograph on a sleeve of a plastic Ono band LP vinyl album dated 9-10-70 could be anywhere between a few thousand to tens of thousands of dollars. However, it's essential to have the autograph professionally appraised for a proper assessment and current market valuation.