Sligh, 2-weight Grandfather clock key missing

by Vicki
(Colorado)

Escutcheon key is missing for this basic Sligh, 2-weight Grandfather clock.

It was part of a furnished apartment we acquired.

There is a number stamped on the back: 02-0308-1.

It is a chain mechanism and without the door key, we have to access the chains from the back panel. Any idea on how we can obtain a replacement key?