This model would not be considered small by most. The model should be around 26" wide and maybe 18" high and 28" deep. It should take two people to lift it.
Let me know if this is not what you see!
It is approximately an 24,000 BTU AC. This would cool a fairly large area. If it were used in an office with fax machines, computers and comercial copiers, then the room would be a good deal smaller.
You could cool approximately 700 to 1,000 square feet depending on conditions.
Used air conditioners do not have too much value today because the cost of new models has dropped greatly in the past few years.
You will need to find someone who needs something this large. This is too large for one or two rooms in a house. For apartments in the USA , this AC would be far too large. It would most likely be used for a business with heat generating machines. We usually put something like this size in a small hair salon. The hair dryers create much heat.
Brand new this model might go for $400.00 to $500.00 dollars depending on the market. A unit that was in perfect conditiona (looked virtually unused), that was 2 years old could go for $200.00 to $250.00. If it looks scratched up and worn the right price would be $100.00 to $165.00.
What will be most important is that you find someone who needs this large an AC. That person would be saving money on something that they need.
Please let me know if you would like more information (or if you see something different in front of you).