There is a Facebook site on Fort Worth history. This is one of the more interesting postings about W&K from someone in the family, but it says nothing specific about a Houston location:
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I don't know the complete history of Wolf and Klar, but I can provide some basic information. The business had origins in Dallas at the Klar and Winterman store located in Deep Ellum in the late 1890s. Jacob Winterman, the Winterman partner was the older brother of several sisters, and Herman Klar was married to one of those sisters. In the early 1900s, Lena Winterman married Herman Klar's younger brother, Jacob. A third Winterman sister (Fanny) married a fellow named Alex Wolf. A few years later, fourth Winterman sister (Sophia, my grandmother) married a fellow named Herman Miller. I guess the Dallas business was not big enough to provide this growing family with jobs and income because in the early 1900s Jacob Klar/Lena Klar, Fanny Wolf/Alex Wolf, and Sophia Miller/Herman Miller relocated to Fort Worth and opened a branch of the Dallas store. Sometime afterwards the name of the FW store was changed to Wolf and Klar. Wolf and Klar operated very much like the Dallas store, a high end pawn shop with a large sporting goods and gun department. The Fort Worth business prospered during the boom years of WW1 and the 1920s. Wolf and Klar also operated stores at locations in the oil boom towns of Texas and Oklahoma during the 1920s and 30s. By the mid 1930s, Wolf and Klar also owned other credit jewelry/pawn operations in downtown Fort Worth. In 1937, Jacob Klar died of a heart attack. One week later Herman Miller was killed in a car accident in Arizona. A bit of a family struggle for control of the business ensued. As a result, a decision was made to break up the businesses. The Klar and Miller interests took control of various smaller stores in downtown Fort Worth (NC Hall, Peacock's) and maintained partial ownership interest in stores in Oklahoma and Lousiana. The Wolf/Lang family took sole control of the Wolf and Klar stores and also operated a considerable wholesale operation. Wolf and Klar operated the old store on lower Main Street until the 1960s. I think the sporting good/gun operation continued until the end. Dick Lang, a Wolf son in law, operated a Wolf and Klar wholesale business into the 1980s. The Wolf, Klar, and Miller families continued to be a close knit extended family (well almost, two second generation brothers in law refused to speak to each other after the split) in spite of the disagreement that brought an end to the partnership. It came as a big surprise to me to learn that Wolf and Klar had such a "celebrity" clientele for some of its firearms. You would think that the Machine Gun Kelly saga would be part of family lore. It appears that Jacob Klar even testified at some court proceeding that he sold the original machine gun to Kelly's wife back in the 1933. There is extensive documentation about Wolf and Klar's gun business to be found with a simple Google search. Who knew?
A picture of W&K's location in Fort Worth