A Ping demo club does not have a serial number

Thanks Phils! All good, might take a punt then as it is only a 7 iron, Im looking for practice clubs to leave at work after forgetting and leaving my 7 iron and 58* wedge there before a comp last weekend. Was lost without my 58, I play everything from 75 in with it, buffered but it could have been so much better, threw away 5 or 6 shots on the front 9 and lost focus on the back. Wont do that again! Thanks chaps