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According to Jazzguitar.be, Wes Montgomery never really found the amp that sounded the way he wanted it to. In his later years Wes Montgomery played this Standel amp : the Super Custom XV has 2 channels, a normal one and a reverb/vibrato one. The amplifier has 70 watts RMS and a JBL speaker.
On this 1965 show, you can see the panel of his amp including the Sandel logo on the left side and the right number of pots : 3 on the left and 2 on the right. Since the video is more than a hour long, go directly at 39:40. Moreover, on the official website of Standel, a short page is dedicated to Wes : http://www.standelamps.com/about_us/story/story_p10.html
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