They were a run of 200, in total, contrary to the previous post. There were 300 of the 50th so it is not (the 75th)less production nor more rare than the 75th. The opposite is true. The 50th introduced @ $375.00. The 75th @ $1200.00.
I (just "Me", personally) care not for a Springfield because it's "not a Randall". You can swing all of this anyway you care to...and I get it...all ways. Just pointing out a few things. The Model #17, Astro, was the 1st knife in space, designed by Bo and Gordon Cooper. There has "always" been significant historical significance attached to this model.
Buy what you like and debate what's what. At 200 in total, I think they'll settle a tad higher....but that's just me. I'm not selling "EITHER" of my commemoratives.
Stay Sharp, Capt. Chris