If your boyfriend just liked the logo or that it was a S&W you probably can't go wrong buying any knife that looks close. I'm sure he'll appreciate the thought. Personally, I would rather you plan a date to a store that has a lot of knives and let me pick one out. The thought would be there, just not the same surprise. The difference is that if he originally bought it because of how it fit his hand it would be difficult to replicate unless you were able to find the exact knife or he may be very happy to try something new. Either way, he'll be happy you thought of him.

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