We just got home from a day of snooping around the local antique shops. We spotted an M1 up on a shelf and was happy to find it was Front Seam Fixed Bale, but sadly I noticed that one of the bales was broken loose on one side and was void of a chin strap. Otherwise the helmet was in excellent condition. With a $45 price tag (no liner of course) the broken bale scared me away so we put it back up on the shelf and moved on.
Now, after browsing through some ebay listings and reading a few forum posts here, I wonder if I should have been a little less turned off by the broken bale and brought this lid home, it would have fit nicely over the Westinghouse liner we stumbled across a few months back!