The playfield looks good; ball drops look good on the zoomed in pics.
Very few BOP playfields were diamond plated.
From the picures looks like this one is one of the DP playfields – recommend get in car and get it.

From IPDB http://www.ipdb.org/search.pl?abr=bop&searchtype=advanced#1502

One Diamond Plate playfield version shown in this listing reportedly has these differences from those made later in production:
yellow billion shot
yellow 1 billion when lit (big wheel)
yellow 500 k (big wheel)
yellow lites extra ball (left loop)
yellow extra ball (small wheel)
yellow lite jackpot (small wheel)
yellow one more time (between flippers)
yellow 500 k (right loop)

From the angle of the pics you can't see the diamond plate logo. It is very close to the apron

image-22.jpg