That dial looks to me like the LDA series, 1975-1976. IIRC, that's when the design changed to those unmarked segments for rinse and final spin.
Our LDA-7800 had separate Knits and Gentle, but still did the low-speed shift on Perm Press. A replacement timer some years later had one-stage cool down on PP instead of two-stage, with an EXTRA LONG drain after wash to take up the space, and still with a one-stage cool down on Knits.