First off - I know that no DS-1 is 'rare' or 'valuable', they're 50 dollar pedals brand new, there's millions out there, and for as many people there are that love them, there's just as many people that hate 'em. That being said: I've picked up a couple real cheap in the last few weeks, I was planning on tinkering around with them, trying some mods and such. One of the older ones intrigues me - it uses an ACA adapter, has a black label baseplate, is made in Taiwan, and has the Toshiba TA7136AP preamp chip. I've read that when they moved to Taiwan from Japan, they switched from the Toshiba to a ROHM op-amp chip. Mine is a made in Taiwan Toshiba chip - is that like a 'transitional' model? from what I can tell, the preamp chip is more desirable. Again, 'desirable' is relative, they're not high-end boutique pieces of equipment. But I do enjoy poking around with pedals, and learning what I can about them. I've had them apart, and I can't find any serial #, or any numbers at all in the body itself. The board has some #s, but I haven't been able to decode any of them, they don't seem like serial numbers. The #s on the top side of the board are: DS-1 (ET28F) ; and ET5205-5108B. The bottom of the board is stamped with: DS-1 2291032607; and 052-286. I check with a serial number decoder - the only one that it accepted was the ET5205, it said that it was May of 2005, but that's impossible - it can't be that new what with the ACA and the Toshiba chip. I know it's not real important, but just one of those things that I'd like to know. Any thoughts on the mfg date, or about the combo of the ACA and Toshiba chip being made in Taiwan? Sorry about the ****ty pics, and thanks in advance!