To get a better idea of the potential value of a specific 1991 Oasis poster, you can browse through recent sales listings on eBay and other online marketplaces. This will give you a sense of the prices that similar posters have actually sold for. You can also consult with a reputable appraiser or collector who specializes in music memorabilia.
Here are a few general factors that can affect the value of a 1991 Oasis poster:
* Condition: The overall condition of the poster is one of the most important factors in determining its value. A poster that is in excellent condition, with no rips, tears, or stains, will be worth more than a poster that is damaged or worn.
* Rarity: The rarity of a poster can also affect its value. Posters that are limited editions or that were only produced in small quantities will be worth more than posters that are more common.
* Popularity: The popularity of Oasis and the demand for their posters can also affect their value. Posters from more popular eras of the band's career, or from iconic concerts or events, will be worth more than posters from less popular periods.
If you have a 1991 Oasis poster that you are thinking about selling, it is a good idea to do some research to get a better idea of its potential value. This will help you to set a realistic price and to avoid being scammed.