Ummmm, they're Sea Horses and I'd choose the top set if I was looking to buy. On the 2/- 6d it has a nice light cancel and doesn't obliterate the Monarch's Head. The 10/- ones are basically identical and the 5/- the top one has a better cancel.
Now, are they the re-engraved set ?
Perhaps a close up scan of each would help determine the issue. Also, don't be fooled by the catalog value on these as I just saw a sale of the 2/- 6d & 5/- selling for $10 US for the pair.
Here is a set with Postal cancels, not Parcel cancels as the Postal use commands a higher premium. The set of 3 went for a little over $30.00 US
http://www.ebay.com/itm/1918-Seahor...em3a6f7cd45eEdited for stupidity