Japan- 1975

4 functions
"November saw the release of the first LCD display from Casio, the Pocket-LC it had the usual four function plus Square root and Percentage plus a memory recall key. Naturally, as one would expect, it was far slimmer than the 'Flouro' display calculators. The Chip was a T333 and the LD0503 display was mounted in a cradle for easy placement and replacement."
Ray Mackay, Old Casio Calculators

Source: Ray Mackay

X-Number World of Calculators