Hi hope someone can help on this issue.

I picked up an AVIA which is in mint condition but can’t get it working my feeling is there may be something missing from inside.

OK details written on the movement are MDK 1210001

swiss made V2
inside the back cover i have found the following ESA 6155-2

Can anyone advise please?

Not sure if it’s missing something, the + and - battery terminals are there.
A battery bracket or holder could be missing.
I have had some success leaving a full battery inside.
A few of my seiko’s did not work ,but leaving a battery in for a couple of hours made them come back to life.
I’m not sure if this works in your case ,but it’s worth a try.