The following year the more-familiar P-series appeared, initially with the orange labels, but soon changing to red. They were still 5½" and using the M-series number as a matrix (now prefixed W- rather than M-). Some early P-series pressings (specifically P-2) have been reported with a P- catalogue number on one side and an M- number on the other. All Mimosa records couple a copyrighted tune with one where the copyright has lapsed or was owned by Crystalate. The 5½" discs ran from P-1 in October 1922 to about P-240 in April 1926. The W- matrices continued in use on other labels such as Oliver and Kiddyphone.

Mimosa, meanwhile had introduced a 6" series starting, rather confusingly again at P-1 and probably being issued from January 1926 until about the Summer of 1928 by which time they reached P-227. The matrix series was in an E-100 range, and, again, they continued in use after Mimosa's replacement (by 7" Victory records) on Oliver & Kiddyphone records. However, the company also made use of their old 5½" masters on the 6" Mimosas, noticable by the larger blank area at the outside. Confusingly, the old W-series matrix numbers were often re-prefixed with a E-.

There are a handful of American issues on the 6" series, usually dubbed and edited from Items available in full on Crystalate's main Imperial label. These issues have a matrix number in an A-1 series.

The music available on Mimosa was unashamedly popular; after all, they were aiming at a children's market. There were plenty of dance band recordings, mainly by bands directed by Stan Greening and Ronnie Munro but with a handful by Geoffrey Gelder and Hal Swain. In the early period, the bands appear to be either the Marlborough Band or Jones' Band, about which nothing is known, and neither of whom appear to have recorded elsewhere. There are plenty of foreshortened Overtures and the like, usually played by military bands, also songs of all types and solo intrumental pieces.

Crystalate were very late in introducing Electrical recordings. None of the 5½" Mimosas are Electrically recorded, but the 6" ones are (at least on one side!) from about P-200 when there was a spate of American dubs, probably because they were the only Electrical recordings available to them.

Label designs: 
The extent that each design was used is still being investigated, remembering that records can be found with more than one design if they remained in catalogue for long enough to be re-pressed. Hence, it is the highest use of a design which is significant here.

Type 1: The orange background type was used on the single-sided, the coupled M-series ones and the first P- series ones (highest P-21). 

Type 2: Used on the early 5½" records up to about P-216 (highest found to date).

Type 3: Used on the 5½" records to P-239 (highest known 5½"). Also used on the early 6" P-series from P-1 to P-97 (highest found so far).

Type 4: Used on the 6" P-series to P-167.

Type 5: Used on 6" P-series to P-207. Some will state "Electrical Recording" on the label, but these are usually the American recordings.

Type 6: Used on the last few 6" P-series to P-227 (highest known). Most new recordings on this label are labelled "Electric".