A somewhat vintage looking Snappy box might be available for me to purchase. I'm told that it's a model KR7100C. I'm totally clueless about it. 
A few questions for the experts please. Any pros or cons about this particular model? What's the approximate vintage? Is this a popular or sought after model? What would be a fair and reasonable offer be for one in nice condition?
Here's the pic:

A few questions for the experts please. Any pros or cons about this particular model? What's the approximate vintage? Is this a popular or sought after model? What would be a fair and reasonable offer be for one in nice condition?
Here's the pic:
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