That is a very nice Constellation in barn find condition.
You need a crown and stem. Stems are easy to find. The correct thin 10-sided crown was discontinued by Omega years ago. They are almost impossible to find today. Omega does not have them and uses a designated replacement part.
The crystal may polish up OK. If you want to replace it, you should be able to.
Any competent watchmaker with experience with vintage watches should be able to service the movement. They should be able to source most of the routine parts like stems, crystals and mainsprings.
Do not send it to Omega. They will charge you $1,000 and will want to replace parts with incorrect replacements.
I would not waste hundreds on an Omega OEM watchband. Get a
Keleran USA alligator or crocodile band for around $30 on eBay.
Original buckles from the 1960’s may be found on eBay as well.
There is lengthy thread here about buckles and what to look for.
When all fixed up, there typically fetch $1,000 to $1,500 depending on condition.
Hope this helps,
gatorcpa
Click to expand...