I'm trying to find all of the date codes for the first generation Philips Alto lamps, specifically pre-2006 with the Philips shield, in the same way that someone would collect coins. I currently have 25 different date codes, but it's gotten tougher to find new date codes since I only find repeat date codes in my travels. Not many of these older lamps are available on eBay so I've exhausted that resource.

I recommend,  that u check restores,  yard sales,  estate sales,  flea market,  facebook market place.  Dumpsters and abandon places with permission.