HP 59309A Digital Clock and K10-59992A

[markgreco]

My first post here!
I own a HP digital clock HP 59309A and can find lots of information on it.
What I can’t find is anything on the K10-599992A battery backup.
I’m trying to make a replica as they are close to impossible to find. I’m able to find a few online photos but that’s it. Supposedly you could access the batteries from the front as you may want to rack mount it. Any detailed information or point me in a different direction. I have emailed a few folks that may have one with no luck.