Although Edison would continue to manufacture cylinders until going out of the record business, in 1912, the "Diamond Disc" was introduced. Two sided, it could now hold much more audio on one disc.
Edison was steadfast in his method of recording on discs - the sound should be at the bottom of the groove. Other phonograph manufacturers designed their machines to read music recorded on the inside of the groove.
From 1921 to 1926, the labels stated "Edison Re-Creation". From 1926 - 1929 they stated "Edison Record".
While recording at the bottom of the groove produced better, more long-lasting sound, it also required discs much thicker and more fragile than those sold by the competition. With more and more records being produced by more and more manufacturers, it remained so that only discs manufactured by Edison could be played on his machines. This would lead to the downfall of Edison Records, although in 1928 plans were made to switch over to the inner groove technology, and several records were made, but it was too late and production ended in 1929.
The pressing date, not necessarily the release date, of the disc can be determined by viewing the "L" side label, 12 o'clock position. There will be digits stamped in that position.
The last digit is the year, the first set is the month. For example 13 would be Jan 1923.
When adding Edison discs (though it seems odd) keep in mind the A side is facing right. "Right" is the A side and "Left" is the B side.
Matrix / Runout (Side R label): 19077
Matrix / Runout (Side L label): 19076