The model RL-1 was the most expensive Bench model in the mid 70's. It is a Fastback design. the HOH model was just a little less money. It was a Wingtip model. Both were "Heart of Hide" mitts. The Bench mitt from November 2015 was a real nice one. With gloves/mitts of the modern era, condition is paramount. It's why that one brought good money for the seller. An almost exact mitt sold in July 2016 for $177. Also, near mint but a flaw in the cloth patch hurt the price. Buy a copy of Joe Philips "Vintage Baseball Glove Catalog Source Book" for more info. Also join http://www.baseballglovecollector.com
for access to glove catalog photos of many brands through the years. The "Modern Glove" website might also be of help for the era you have interest.