The Royal Geographic Establishment was created in 1825. Most records seem to come out of Scotland and cease after the turn of the century. It was entered and recorded at Stationer’s Hall, which is a sort of archives and registars. Williams Johnston was a printer in Scotland. He and his brother started their business in 1825. It was his brother’s idea to focus on maps because he was a collector and found most of what was currently out to be inaccurate at best. Until 1862 maps were their primary focus. They were so advanced that they actually created the first physical globe.
W & AK Johnston was your map maker. Their firm would have designed and printed it. They kept most of their designs and printing in-house so to speak.
The only downside to their maps is that they were so popular that they were pretty mass produced. Many were used in books, schools, offices, etc. Given the size, yours would have had this use too.
Yours looks slightly colorized, which would be a bit later of a map. They were hand colored. It should date to about 1870 or so. There looks to be very little damage on it. I just notice a few slight flaws near the bottom, but other than that it looks pretty good.
Based on my records and guides, it should have a current secondary market value estimated in the range of $125 to $175.
For selling, Etsy and Amazon are turning about to be a great alternative to Ebay. http://www.bonanza.com and http://www.artfire.com are pretty good up and coming online sites. Etsy has fantastic rates and really does well with historical items, like maps and you can sell worldwide.
Rubylane, Tias, and Cyberattic are great selling sites too, but do have higher fees.
You might check out the consignment cost with any local antique shops. Some places charge about 25% to 30% of final sell price, but in dealing local you generally have less competition. It's always worth checking out.
Ebay is more or less a last resort. It does reach a lot of people, but the values tend to be lower. You will always get a higher value by selling it yourself as opposed to an auction or selling it to a dealer. If you do decide to try Ebay, consider using reserves.
If I can be of any further help or if you have anymore questions, don't hesitate to contact me.
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