Well, to pick the nit between a K-32 (.) and a K-32 Masterpiece, my K-32 1st Model (#681819) was shipped March 25, 1940.

My first K-32 Masterpiece (2nd Model K-32?) #K58970 was shipped March 24, 1949.

My second K-32 Masterpiece (3rd Model K-32?) #K232389 was shipped December 12, 1955.

I reckon that's the end of the K-32 Masterpieces, per se, to be followed by Post Masterpieces, perhaps better known as Model Numberpieces. I didn't have any of those, preferring items with some semblance of soul---or creativity----or style----or pretty much anything besides numbers.

Ralph Tremaine

And as an aside of dubious value, my letter on the 1st Model simply states "These early K-32's are officially known as the K-32 First Model. " I reckon they felt that was necessary after whatever all that gobbledygook Jeff was talking about what the early letters were saying.

As another aside of dubious value, my "2nd Model K-32?" was a narrow rib version with the funky finish ("Satin Blue")---the 3rd Model being a wide rib, bright blue.