Congratulations bigminnow,
You've stumped two of the most knowledgeable guys (articap and Pahoo) here on the BP forum.
When Google'ing the words 'Thompson Center Pro 550' the only place the word Pro shows up is with the Encore 'Pro' Hunter. The only place 550 shows up is a few Thompson Centers selling for $550.
More info., pics., link required indeed.
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