A globe mount is simply how a globe is attached to a base so that it can spin. If you boil it down there are really 3 types of globe mounts. 1. Offset, or simple mount 2. Meridian mount, 3. Full mount. I want to explain in words and pictures examples of each, so let's get started.
|Offset, or simple mount|
|Full mount globe|
Just as then, today collectors can find all styles, and plenty of variations of these 3 main styles for sale, and just as then sometimes the price of a vintage globe is influenced by it's mounting style. All other things being equal I would expect to pay about 20% more for a globe in full meridian and an additional 20% premium for a fully mounted globe.
For example if you were to find a nice 8 inch Weber Costello globe with claw foot base in the simple mount I'd expect the price to be $250-$400 based on condition( at auction). If this same globe, same condition were in a full meridian, I would expect $300- $500. And If this globe came up at auction in it's full mount variant ( the most rare) I would expect to pay somewhere in the $400- $650 price range. Again this is a very rough guide but I want to illustrate how the globe mount will affect value.