10-05-2012, 01:18 PM
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The "W" may be the initial of the original buyers first or last name. Horn caps are frequently customized by people wanting something unique.
The "307" may indicate that the owner was from Wyoming (it's our area code), liked Wyoming, a model number (not likely in that location), or something completely different.
The saddle may or may not be custom made, as the tie strap holder where most maker marks are, can be easily changed or removed completely. You certainly have a mystery.