It's probably being sent to people who haven't purchased anything in a long time to entice them to buy, i.e. not you.
I think they just send them out randomly, I also received the GILT50 code 4 days ago and purchased Paul Smith travel umbrella with it.
Have more than one Gilt account in your name, it will maximise your chance of success.
The code's GILT50.
I tried this on Park and Bond, it does not work...is it exclusively for GILT.com?
I enter it, click apply...nothing happens, no error.
I haven't bought anything off GILT in a year, maybe your account needs to have a minimum spend to get the coupon?