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From the photos posted on MB Klein, both the M1a and M1b have the extended lettering on the tender, and both also have train phone antenna on the tender. The main differences are the pilot and headlight/generator positions. This would make the M1a appropriate for mid-1940s to mid-1950s, and the M1b for 1950s. I'm getting one of each. Gotta go - time to check the USPS tracking progress.
Pretty? She's got a blunt face, lopsided boobs (domes), and thick legs. She does have a flat belly (Belpair firebox) and a huge tender (a$$).
Let's share our favorite photos of the M1a/b's so we can accurately weather them!
The Railwire is not your personal army.
Here's some proto photos of the numbers on offer:6743 at Philadelphia in the '30s:http://www.northeast.railfan.net/images/prr6743s.jpg6798 at East St. Louis, 1947:http://www.northeast.railfan.net/images/prr6798sa.jpg6716 at Harrisburg in 1950, getting help from a streamlined P5:http://www.northeast.railfan.net/images/prr6716.jpgI have 2 coming, and I'm not even a SPF. Both early, one undec for possible use of the mechanism for another project although after looking at these pictures, I could heavily weather the Undec and you would never know. I can't see lettering anywhere but the Keystone on the front on those.
Closeups:
I don't think there's a backup light either. So, the website says there should be a backup light, but at Klein's today, when testing both the A and B, there was no light on when reversing.