So I've had some success getting rep mgmt. leads/clients using a two pages sales letter in a regular white envelope (printing the address, personal return label, stamp at 30 degree angle : ). I've upgraded to premium, heavy paper for the actual letters as it looks more legitimate than cheap paper. I'm using a standard biz letter format with a headline under the date.
What I'm wondering is, does using letterhead make sense? I know I should test it, but I'm operating on such a small scale the results wouldn't be statistically significant. In short, I'm not sure if it will tip the reader's hat that I'm sending a sales letter (negative) or make it look more legit versus plain white paper (positive).
Any input from people with experience would be appreciated.