Believe it might be the 20th series. April 1, 1942 Service Counselor has this article mentioning the new accessory.
Packard didn't provide many details so the question might be if theirs was vacuum operated or just a foot or hand pump operated device.
The unit is mentioned again in SC's for the 21st series and a photo of a vacuum operated device is in the 22nd series acc. catalog. Some ebay vendors have the same Trico unit Packard pictured in 48 listed as being on GM prewar cars so chances are it was the same and vacuum.
Sure wish the list price for those ebay items was still the same as Packard mentioned.
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