I recently bought a IR46 Mobilgas and IR47 Mobilgas special pump plate for $475 for the pair. They are both 9+. I thought I paid high retail for them. I've been watching them on ebay recently and some of them are selling for good money (i.e. $601 for a mobilgas recently and $587 for a mobilgas special). My question is are some of the dates these were made more rare and therefore more valuable (IR46 vs.IR47) or is it just condition? I know the plates with diesel and marine are worth more but it seems these pump plates are selling really high. Any thoughts?