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Go on google, type in 1680 bezal inserts and click on the images tag. Pick one of the images that shows multiple inserts against each other and open that page.
I would recommend that you look at the 4 in 40 and the 5 in 50 as a starting point. Click on pictures of each numbers, zoom in as much as possible, open multiple tags if necessary and click from one to another.
The mark 1 has a kissing 40 - meaning the print of the 4 touches the 0 - the is little or no gap between the numbers.
Mark 2 has a longer 5 - look for the shape of the inner part of the lower bit - on some looks like a little hammer, on others looks like a little axe head.
Mark 3 is very similar to mark one, but definately no kissing on the 40.
Later marks are much thinner fonts. On the image below the inside of the 4 in 40 the top is flat - known as a flat top 40. On the marks 1 to 3 the inside goes to a point - like in a triange.
Check out the two fonts on the image below. The DRSD has a mark 3 fat font insert, the one in the little metal tin is a later thin font service dial.
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