In the last 8 months a friend of mine in another state and I have become pretty adept at dating Drip Edge Silver Faces; particularly the Black Line ones; and more specifically the Black Line ones containing the Black Face circuits inside. It all started when I picked up this Princeton Reverb from the 3rd week of 1968 followed by this Super Reverb from the 6th week of 1968 that you all helped me with a ton. Now, both these amps were found in and around where my friend lives, and he picked up a Bandmaster from the 5th week of 1968 at around the same time. I don't want to give away the fishing spot, but black line, drip edge Fenders keep popping up on Craigslist in his area at a clip you wouldn't believe. I have to believe the #1 Fender salesman in 1968 had to be out that way. In the meantime, I serviced and repaired a Black Line Super Reverb he found in the area along with a couple other Fender amps of the era we've helped friends get into. A couple weeks ago he picked up a Deluxe Reverb that was sold as parts, not working. He sent it to me and its 5th week of '68, exact same as his Bandmaster which is pretty cool. Its still here actually. I found that the rectifier tube was shorted out from damage caused by the filter caps being dead shorted. I replaced all that, plus found several fried resistors, including the 1M across the input jack which was causing a loud hum. There was/is also a kinda green, powdery coating on the outside of the chassis I'm not sure about, but its not on the inside. Pictured here is his Deluxe along with my Super Reverb and Princeton Reverb. All 3 amps were built within 3 weeks of each other. I like to say they all came out of the same pile of parts. So, that Deluxe is sounding so great now that we pounced on another Black Line, Drip Edge Deluxe Reverb that popped up on his CL this weekend. The amp we picked up today is super clean except for a couple spatters of white paint somebody got on it (any tips on how to remove paint from the grill cloth?). The guy who sold said he believes no work has ever been done to it. It includes the original foot switch, cover and, get this, the warranty card, promo material, user manual and schematic that came with it! Here's where it gets interesting and we'd appreciate any input, history, or feedback you guys can provide. From the ad on Craigslist I noticed that the back plate on the amp we picked up today called for a 1amp SloBlo fuse and I recalled his as calling for a 2 amp fuse, which I then verified. Thinking maybe this one had a later circuit than AB763 I did some research and found that black face AB763's originally called for a 1 amp fuse but it was later changed to 2 amp, and all the subsequent silver face versions had 2 amp fuses. So he picked the amp up and we found a couple other things. The speaker and PT are stamped early 68, but the choke is from 1966? He also found a date stamp on the outside of the chassis, sometimes there is one outside we've found, and it indicates 20th week of 1968. The last significant thing I noticed is that in addition to his back plate calling for the 2 amp fuse, his just says Fullerton, CA on the upper right, where mine says "Fender Musical Instruments Santa Ana, CA", they both say Fender Musical Instruments on the front plate btw. Of the other handful of early 68 amps I've had come across my workbench in the last 8 months they've all had the Santa Ana location. I cant figure out why his has Fullerton? Further, the chassis SN on back of his chassis (near the Reverb input) indicates his should be a mid-67 model if you follow Greg Gagliano's system, yet the date stamp clearly says 1968. It's our theory that a pallet of chassis arrived with Serial Numbers already stamped in them and they were then grabbed in no particular order, and parts like transformers and whatnot were also grabbed in no particular order and once it was complete it got ink stamped with a date code. That would explain the engraved Serial Numbers not being being chronologically aligned with the date stamps. I figure the back plates and whatever else coulda been grabbed out of order too, we all know they kept those AB763 Tube Charts on them for years after the AB763 was long gone. What I can't figure out is why his would have the "new" 2 amp fuse call out along with the, what I think is older, "Fullerton" back plate, while mine has the opposite. All I can guess is that his has a black plate left over from the Fullerton black face era where it had been updated to a 2 amp fuse, and mine has a new back plate from the Santa Ana era and they erroneously had 1 amp on the initial run? Thoughts, history, insight and discussion into this or any other oddities about amps of this era are greatly welcomed.