COOL Chart! Thanks for that.
My 149 doesn't exactly fit. It is tri-color 18c (not "K") nib w/ plastic threads for the filler knob. (I think) a single section barrel. Feed is the plastic w/ horizontal combs.
Didn't I read somewhere on these boards (or in an attached article) that several MB 149's "back in the day" were stocked in stores w/o nibs? Therefore the retail outlet could then add the nib as requested which made it more convenient to stock and store the pens? It would make sense then that nibs drifted onto later model bodies and vice versa........
Here's an image of one of my 149s, post-1985, with a 2-section barrel. The arrows show a line visible at the junction just below the threads and above the ink view window:
AHHH!! I see. That was very helpful. Mine's definitely a one-piece barrel as just examined under a 10x loupe. And I apologize as I didn't mean to hijack the thread w/ a discussion about my particular pen.
I'll still post a pic later tonight and see if we can "chart" it. I'm certain that Hari's surmise is correct, and will still try to find the info re: MB 1494 stock in retail outlets w/o nibs.
Thank you and, again, wonderful matrix you've produced!