Tick-er-tock....perhaps

Saffron's cabin clock. Lives on the forward bulkhead and is held on by three screws which need to be unscrewed to adjust the time.
I put in a new battery in early March and it was still keeping perfect time when she went into the water at the end of April.
After a bouncy maiden voyage the time was hours wrong, took it off, reset it, and a few days later it was hours wrong.
Last trip I brought it home, took out the battery, checked the voltage which was OK and put it back. Been keeping perfect time ever since.
I shall put it back on the bulkhead and give it one more chance.......then it will either work or become a hermit crab's new home!