That I don’t know, but I have a 1923 business directory for Denver and the Baxter company isn’t listed. I think some of the sellers for advertising paraphernalia are guessing the dates for what they have, and some say the company was in Victor, Colorado not Denver. They seem to have had agents in Victor and advertised widely there since it was at the tail-end of it’s mining boom in the early 1900s. But as far as I know it was a Denver company, as said in this ad for another of their brands [the ‘electric fish’ referred to below was a novelty made from cellophane that moves around in your hand as a result of static electricity]:
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After retiring from the cigar industry, Robert Y. Baxter seems to have gone into the hotel business and commissioned the construction of the Baxter Hotel in Denver, which opened in 1912 (renamed the Rossonian Hotel in 1929).
As I said, the token itself is from before “Greenduck” changed to “Green Duck”, which I think was in the early 1930s. The company name was originally intended as one word (derived from the names of its founders, George Greenburg & Henry Duckgeischel) but so often expressed by customers as two words that they ultimately restyled the name as “Green Duck”.
Roper & Baxter was a wholesaler of cigars in Chicago, which went bust in 1895. I saw one eBay seller claiming his “Baxter’s Drum” item was from Roper & Baxter, but I think he’s mistaken. The two companies had no connection as far as I know.