I think I've seen this referred to colloquially as "railroad rim." Here's the first link google spits out for that query. (052) Not Allowed - Auto-Removed .com/partial_collar_strikes.html You can compare and see if this is what you've got.
Oops. I'm not familiar with the terminology. I thought I saw reeding on the rim described as railroad rim somewhere. Although, now that I think of it, I'm not sure how a reeding imprint would get on the top of the rim.
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