The Coronet/Allegro information below is from the 1955 Fisher catalog AK member Duffinator scanned and sent to me. I was lucky to find these since I had not labeled the files with both chassis and cabinet names - just "1955 Coronet" but I knew I had seen a high-res image of one of these Allegros somewhere.
There really ought to be a few of these still kicking around since they were produced for quite a number of years - plus they're not huge or unattractive. (Darn it, now I want one.) They were fairly expensive, though - in 1951 Fisher upped the price from $595 to $745. Plug those numbers into an inflation calculator for a shock. Jason, is there a serial number on the R-2 that might give a clue as to their production up to the time that yours was produced?