I know this is an old post but I have a weakness for 1920.
Coin 1 has a bulge at VDG. That obverse was paired with both a dot over and a no dot reverse, in this case it is the dot over where the dot is very worn.
coin 2 is probably a dot under (but the dot isn't visible), it is most unlikely to be a no dot as it has none of the faults of the known no dot coins.
Coin 3 is a dot under as it has CBL (curved based lettering on the reverse)
Coin 4 is too badly degraded to tell from the photos.
Highest value is $5 for coin 1, $3 for coin 2 and coins 3 and 4 are worth under a dollar.
Basil, a dot over top scroll coin is worth over $100 for just an average grade coin. At F grade you will be looking at $2-300 and at VF over a grand. The double dots are worth perhaps a quarter of that.
Squire, if you get back to sorting out the dots I hope you have patience, after 10 years and 5,000 hours I still have not sorted the dots fully out. If you attempt it then you are best to first sort them out according to CBL and FBL (all 1920 CBLs are dot under) and then identify them by the die cracks, defects and die clashes as at least 70% of dots are not visible on coins. For 1919 the differing slopes of the numbers also helps.