Single Size Humbucker Pickup, White

This is a considerably old single-size humbucker. It was installed on a vintage guitar I purchased used. After purchasing it, I replaced it with a standard single-coil pickup, so it has been stored in this condition for a long time.
Considering when it was acquired, it is certain that it is at least 20 years old.

Based on the 1N sticker on the back, the color of the magnet, the blue tube on the lead wire, and other features, I believe it is the oldest specification Seymour Duncan SVR-1n (Seymour Duncan Vintage Rails Neck Single Coil Pickup) from the 1980s. However, as there is no Seymour Duncan logo printed on it (it's unclear if it was never printed or if it has faded), and the only information is the 1N sticker, I am listing it as a junk item of unknown manufacturer.
The visual characteristics closely match those of 1980s models found when searching for SVR-1n, and the sticker on the back is the same, so this is just my assessment.

As you can see, it clearly has a very old vibe.
It is likely that it was originally white, but it has slightly discolored and has taken on a vintage white hue.