Shane,
That`s a beautiful IIIf RDST, with the "late" engraving, but it`s still not the most coveted version of this type.......
For the IIIf nuts, the 1956 #824xxx series of the IIIf RDST are perhaps the rarest of the breed, as they also have some interesting features as a IIIg shutter etc.
(I have`nt seen one in over 10 years!).
I used a early 1955 one back in Germany for many many years, and it was also mint minus (they are truly hard to find in this condition) I sold mine to a Swiss collector for $1,000 (over 20 years ago) with a matching Red Scale Elmar....I really miss that camera, just like I miss my first LEICA a 1939 "matching numbers" IIIa with a very early Summitar! 🙂
Tom