I tried Googling 'graze-point Stroebel'. There's a church called Grace Point Evangelical Free Church, which has something to do with a Lee Stroebel. It looks like he's one of the big shots there. Maybe that's what the poem is hinting at?
It was tucked away inside an original script of Barfly that I bought from Scott Harrison. I'm guessing that Scott stuck it in there for me to find.
It seems vaguely familiar, but I can't place it. The way his name is at the end of the poem would indicate that it was xeroxed from a magazine appearance.
If I had to guess when it was written, I'd say maybe late 60's / early 70's. But I'm not basing that on anything other than my gut reaction, so I could be completely wrong. I'll email Scott to see if he has any info.
I was just looking at this again, and it doesn't match any of the typewriter samples, so dating it from this is difficult. I'm assuming the magazine typeset it. If they didn't, and that's just a copy of the manuscript, it's a much later poem, likely done on the computer (look at the 'g' - it isn't a typewriter font).
But I think your gut is right, it doesn't read like a later poem. And the occasional line/stanza indentation is something he left behind, for the most part, after a certain point.