Financial calculators puzzle

[Chasfield]

There was the Aurora FN1000, which was an HP12C clone in portrait format, with the buttons moved around. I also found pictures of a couple of old one line display Canon financial models but those are very different.

I have received my Busicom FN200, and I would say that it is pretty decent for 5 GBP.

It computes time value of money problems at about the same speed as my HP12C and lacks only NPV and IRR cashflow functions. Its additional unit conversion functions would actually be more useful to many people and they are quite nicely implemented. One unit pair legend appears as a shifted function above each key and it is called by either of two blue arrow keys, depending on which direction you want the conversion to go.