Yeah - that one is gorgeous! The tapered wristband is very nice, yet somehow, the three circular sub-dials seem to fit in very beautifully.
I'm not very good at the history of the Rado Seahorse watches - neither are Rado, because they never kept any archive or museum. So most of the information is pulled from the internet.
Here's one of the better identification resources if you have a question about which Rado you are looking at:
http://mike184.beepworld.de/radomodellemodels.htm
As far as I can recall, the 'horse' symbolises 'fortune' or luck - Rado, being a Swiss manufacturer, found a significant market in the Far East. And they were correct; today, something like $2.6billion is spent in Hong Kong alone, compared to $3.1billion in the USA - and look at the size of Hong Kong vs USA!!
Around 1956, the Green Horse was introduced. Then the Purple Horse, and the crowning edition - the Golden Horse. Re-editions were introduced; so there is a Green Horse series from 1980-1982 as well. Rado, produced these in batches of limited editions of 2000 or so watches over the years; consequently, it is very hard to find two exactly identical ones, and many minor changes in a Green Horse can exist.
The Green and Purples are generally cheaper than the Silver, Golden or Black Horse watches, unless they have been faked, copied or re-created using non-Rado parts.
There seem to be so many variations of this superb watch! Condition is everything though