A handy person from New Mexico says:
photo is of sliding glass roller - circa mid 1980's

Steel roller is 1.5" diam. Width of housing is 1/2". length of housing is 2 - 5/8"

The markings on house appear to be L-S 7873 NYC
Thumbnail of the uploaded file named PATIO DOOR ROLLER.jpeg
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Paul from SWISCO responded:


The part in your picture is actually only the inside portion of a complete roller assembly. There should be an outer housing, perhaps still installed in the door. Since this is Allen Stevens, though, and since you have a 1-1/2" wheel, you could consider our 81-278 patio door roller. You may want to remove your outer housing just to confirm that this could work. Thank you!

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