16800 and 3035 - Service Life

[camwilson04]

I have a question that’s been on my mind for a while.

I own a 1986 16800, and the movement was serviced by Rolex in late 2022. However, I can’t shake the feeling that when it’s due for its next service, I might run into difficulties due to its age and the potential scarcity of parts.

Am I overthinking this because there are still a lot of 3035 movements around, or is this a legitimate concern?

In a way it's ruining my enjoyment of the watch however I'm probably overthinking it as it's my only vintage piece