How to identify shifter

Is there any way to identify easily if the tiagra 4700 shifter is for a double or a triple? I bought one off ebay but i have a nagging feeling its for a triple,if so i am going to ask for a refund as i think it should have been listed as 4703. Is there a stamp or an obvious difference or should i just fit it and count the clicks?
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I assume you are waiting for it to arrive and you don't know the answer yet, so you're just thinking out loud on here.
If it's gonna arrive (or has), see above, and work it out then.
I don't know.
Instead of asking for a refund, why not contact the bloke and simply ask if it is for a double or a triple as you think it is a triple?
If he confirms it is for a triple, then ask if he'd be happy to have you return it, and mention 4703 in passing.
Or... just sell it on for what it is? (on here)
It depends what you think is the least hassle, and I assume it cost very little, so absorbing postage and things might be something that concerns you?
I'd start with doing what I said, the reply will give you a good insight into the seller and who knows, he might say "sorry, send it back and I'll refund you" or "I'll refund you and you can just keep it" you just don't know until you open up communications ...if I'm selling anything I treat people like they are nice people, want the goods tomorrow and have been saving up for it, you might find the seller is like this.
EDIT: just discovered on compatibility chart that 4700 and 105 5700 are not compatible so that at least clears one thing up.
You're right in that the newest 10 speed Tiagra has a different cable pull from the old 10 speed 105
There was a spate of failed 4700 LH shifters when they first introduced it. You sure the one you have is working?