Well I thought that I would help out by putting up a link for the Sixty. Model celebrates the sixtieth anniversary of the type. This ones #99 out of 500 that was built in 1991 for the anniversary. Made from Sterling Silver and gold plated steel with a real diamond in the rad cap. Measures 12 in long and weight is approx. 26lb.
http://www.ebay.com/itm/Caterpillar-...#ht_102wt_1133