Very interesting indeed! So, it appears the SK M137 or Wards Silver Streak wingbar were never offered with the speedo neck, nor was it even an accessory in the catalog. It does seem to have come as standard equipment on the Flocycle, however.
I can only imagine the reason I see that speedo neck on wingbars is owners put them on to dress up the bikes? But maybe dealers up-sold them to customers too? Similar to why I see so many Wald tomahawk stems on Shelby Airflo bikes... as far as I can tell, they were never standard equipment on that bike, but collectors love to put them on way more than other bikes, to the point where many believe they were standard, factory equipment. Is that a relatively recent trend, or were dealers back in the day offering as an upgrade?
Thanks for all your input folks, it looks like the factory issue stem for the M137 is the winged, art deco stem, and for the Wards Silver Streak is the two-piece "putter" type.
It's clear, (like with cars) buyers of bicycles often made special orders, or changed out parts & accessories to customize their bikes from new. To me, it doesn't make them wrong, or incorrect it only illustrates that catalogs and ads only suggest how bikes were offered in standard configuration.
It's a bit of a conundrum figuring out how I want my Silver Streak set up... as the ads/catalog show? Or as it came to me, or some combination.. either way, it's fun to get input from you fine, knowledgeable CABErs, I appreciate it!