Variations in ribs

[John Havard]

If this has been exhaustively covered in the past I apologize ahead of time. But I did a search and found no discussion on the topic of variations in Parker barrel rib shapes.

We know that there were variations in engraved words versus roll-stamped words. There were different words over time. Words described the type of steel used in the barrels. There were elevated ribs. Somewhere along the line the old squiggly-line engraving machine used so beautifully was retired. My question isn't about any of those variations.

What I want to learn a bit more about is the variation in the SHAPE of ribs that more experienced members have seen: swamped, level, wide, narrow, tapered, other? Were such shapes specified in the original order or did the customer simply receive what the factory sent?

Any light shed on this topic would be appreciated by yours truly.