Hi, GoldieMI. I worked for Les for 21 years, and I did the frame to slide fit on that gun and the checkering on the front strap. A few points are in order.
It appears to be a standard Premier II but those grips are not original. The plum color on the slide is because of the hardness of the steel. Slides are heat treated to around 40 on the C scale and they often turn purple over time. It is harmless. The frames are not as hard and they stay black.
The slide, with the magazine removed should nave no play, or very little, either side to side or up and down. With the gun in battery, push downward on the barrel, over the chamber. It should NOT move, not even a little. If it does it indicates that the gun is worn, or that it was tampered with.
Insist on at least a basic field strip of the gun. The number on the bottom of the slide should match the serial number, it should be the full serial number and it should be followed by a "W" , or a "WC". those are my marks. Look at the link on the barrel. There should be a horizontal file mark, between the two holes. That is the mark of the barrel man. (I can't give out names) If it is not there it is possible it was fitted by another, but 75% of the barrel lockup work was done by one man. If the number on the tag in the picture is the serial number on the gun, it should have the file mark.
It is pretty hard to wear out a well made 1911. If the gun does have a bit of looseness it doesn't mean that it is no good, but it does mean a discount is in order. A slightly loose gun can still go for thousands of rounds. Remember, most 1911s start life out a lot more than slightly loose. A little play only means a little loss in accuracy.
In closing, if you get the gun, replace the springs. You don't know how many rounds have been put on the old ones. Cheap ins.