The best way I've found is to look at Danelectro through the eyes of Nat Daniels. He was a super inventive guy who always favored doing everything in-house as simply and cheaply as possible while maintaining rock solid functionality. That's why he used 3 bolts instead of 4 like others, did his own lipstick pickups, used counter-top material, and etc. Machining sets of strip tuning machines is fast and simple and is what appears on all his other guitars. Doing those individual enclosed machines is expensive in terms of tooling, parts, manufacture and installation so he wouldn't have done them in-house (the design is nothing like how he designed) and he certainly wouldn't have purchased them from an outside supplier. I could be wrong but I'd argue in favor of those being replacements.So that's what I thought. But looking through pics of early 60s Silvertones, it appears the strip tuners came later. I haven't opened the electronics cavity, but this is a '64 or earlier because the 3 neck bolts are in a straight line. It also has a textured control cavity, which I also thought was a replacement, but I've seen in other examples as well.


