It is a door roller stamped strato- track inc.

A quick learner from Shapleigh ME says:
I can't find these door rollers anywhere that go on the bedroom door of a mobile home from the 60's. Do you sell them?
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Tom from SWISCO responded:

Hello! These old pocket door rollers look like a match for our 23-175 pair. Look over their dimensions on their store page and let me know if you think you could use this to repair your closet.

A quick learner from Shapleigh ME says:
Hi Tom, yes I think those might work!Thanks!
23-175 : Pocket Door Roller Pair, 7/8
Pocket Door Roller Pair, 7/8"
23-175
$7.49
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