Aerocat,
It precluded me from flying a NVFR aeroplane NVFR.
IFR GA aircraft were very rare birds in those days.
We had a lovely 260C Comanche that was IFR anywhere else in the world, DCA would do no better than NVFR ---- at least they didn't makes us pull out our very nifty 180 channel VHF and fit an AWA Skyphone, but even that took some negotiating the "standards".
Tootle pip!!