smallest esp32 with RTC built in ?

[abelisbombom]

Hi!
I decided to dive into the world of microcontrollers by making my own little watch. I successfully prototyped it on an arduino board, but I'd like to shrink its size so I searched for the smallest esp32 with an RTC built right in. I found the TinyPICO to be perfectly sized for my project but I realised it doesn't contain an RTC
Does anyone have an idea of a very small ESP32 board with RTC ? I have to admit I'm a bit lost.

Thank you!

[abelisbombom]

update : I think I may be retarded. I believe the rtc is in the chip itself so it doesn't matter what dev board you plan on using.

[ESP_Sprite]

Note that the RTC in the ESP32 chips do not support battery backup. If you need to keep time while the power is off (and getting it again on power-on using e.g. NTP is not an option), you may want to add an external RTC.