Below is a copy of what I found out on the SASS Wire. Looks like the L prefix is simply part of the serial number from USFA. I still do not know for sure. The price on the Rodeos on the internet is still to high to warrant a call to Longhunter. If it drops I may give him a call. If they do not lower the price I will most likely call him anyway to order a new set. I'll ask him if I do.
Tye
The older Long Hunter Rodeos did have the LH--- prefix, but since last year or a little before they stopped with the LH prefix guns and they have just plain serial numbers now. You can tell Jims guns by the action, the rear sight will be wider and the hammer will either be jeweled or polished. I'm sure he will be glad to tell you if he gets the serial # from you. I used to sell these guns for Jim and the last ones I remember selling was in the LH4?? range, this was about the time they stopped with the LH prefix.
Hope this will help in some form or fashion,
Slick