It came with the 19-4 2.5" and fits it like a glove.
Appears to have a S&W emblem on the back.

Thumb break, over-the-belt paddle snap.

Just wondering if it's old or has any collectible value or is a common holster.

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Professional Trainer

Hi:
It is a S&W holster from the late 1970s/1980s.
At that era S&W were offering holsters, caps, jackets.
Strong Leather Company purchased the holster factory when S&W sold it.
It would be of interest to a S&W collector?
Jimmy

During that era, they also had ammunition in the blue and white boxes.