Formats

A 45, a 78 and an LP of the same song are three different records with three different markets. Start with whichever one is in the box.

45 rpm records valueWhy the sleeve is often worth more than the single, and where the money actually is.
78 rpm records valueThe steepest value curve of any format: almost nothing, and then five figures.

Format decides the question you should be asking. On an LP it is which pressing; on a 45 it is whether the sleeve is there; on a 78 it is what label it came out on.