I'll be darned if I didn't win another BK auction and got this. Again, not in the greatest shape, but a nice example of the bill for my collection. The S will be the next one.
I see the Fr.1609 & Fr.1610 sold as pairs in sets most often. That’s how I bought my pair. The R & S experimentals display nicely when presented in similar condition. There’s an interesting story behind them.