Over the years, I've seen dozens of them but then IPD is local. I would think that there were at least a few hundred of them produced. I've seen about the same number of them that said 'VOLVO' before they went to the 'IPD-VOLVO' ones. There was at least one other style they made (only ever seen two of them) that were 'IPD-Portland, Ore.'
I think the IPD-Portland, Ore. were the first ones, and were inspired by the really rare ones from Ellemann-Jakobsen (the speed shop that build engines for Volvo race cars before Volvo had the 'Competition Services Deapartment') and Ruddspeed of England.
I've seen various Volvo, IPD-Volvo and IPD Portland Ore. sell for as little as $100 and as much as $450. Hope this helps.
Chris
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