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Hi Simon, and welcome to the forum.
Your watch appears to be gold plated, as the back is steel. For better information, you'll need to gather the case number from the inside case back and the movement (calibre) number from inside. If possible, please post photos from inside the case back and of the movement.
Can you tell whether your watch has a snap on caseback? If so, you should be able to pop it off with a blunt knife. Just don't pry against the lugs.
It's possible this watch has an integrated case back, also known as a front-loader. If there's no seam along the back where you can separate the case back, you may need to take it to a watchmaker to get to the case number and movement number inside.
Best of luck!
Welcome Simon!
You have nice Seamaster De Ville and it looks like a reference 166.020. You can do a search of this and get more information. They made these with a few different reference numbers over the years depending on when/where it was made.
It does appear that your watch is gold plated, however it may have a solid gold bezel. They came both ways and sometimes you'll find an engraving indicating the type of bezel in between the lugs holding the strap. It looks all original and even has the original crown and box which often get replaced/lost. The dial also seems to be one of the textured styles which is relatively uncommon and they usually go for more money.
However, DO NOT try to open the watch. These ones do not have a removable caseback and if you take a blunt knife to it, you will scratch up the back and hurt the value. This has what was referred to as a monocoque case which is opened from the front by removing the bezel and crystal and should only be done by a trained/experience watchmaker.
I agree with @Dan S estimate. If the bezel is gold, it could go on the higher end. Having the box and unique dial definitely add to the value.