[morzh]

Careful with the dial, don't drop it, or you will have to buy a repro (which likely do exist).

One thing at a time.
Do not power it, you will need batteries or power supply for it anyway.

Carefully study the fastenings, how to pull the chassis out, or better yet, wait for the folks here who has dealt with this model, I am sure we have those here.

Photograph/sketch every step you could potentially forget.

Find the source for batteries or info how to maketgem from the modern types.
Take it slow.

Enjoy, the reward will be sweet.