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Distinctive stampings on fillet brazed frames

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The stampings on the super sports is probably a year stamp or some identification for Schwinn. Schwinn had the same markings on the bottom bracket parts which indicated the year they were made, but in a very smaller size.
 
Both these bikes are from the same year and month but each one has different markings.

I was hoping there were other members here with either Super Sports or Sports Tourers that would respond. Does anyone know of such member(s)?

My thoughts are they have something to do with quality control, in case of a lifetime warranty frame failure they could possibly help identify who/what the cause was.
 
Thank you SirMike1983, now I see it as a horse's head!
He didn't look too close or care about it's serial number stamp though...

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I’m surprised nobody else is chimed in with their super sport. The bottom bracket shell is not an electro forged piece and probably made specifically for these one piece crank fillet braised models. I still think that symbol is a year that the bottom bracket shell was made and I’m curious to find out if that’s what it is. Maybe @Schwinn499 has some recollection of the ones that he had.
 
@GTs58, as I mentioned both these frames are marked with a CJ serial number so in theory they were made the same month/year. You're right about the shell though, it appears to simply be a slice of larger tubing.
I'm so curious (how curious?), that I'm going to take a 50 mile drive this morning to pick up a stripped down Cool Lemon SS frame I've been watching on FB Marketplace just to see what hides on it's underside. It also has a three piece bottom bracket adapter I want and I've talked them down to $20 so the cost is mostly in time/fuel. Thanks for your support!
 
@GTs58, as I mentioned both these frames are marked with a CJ serial number so in theory they were made the same month/year. You're right about the shell though, it appears to simply be a slice of larger tubing.
I'm so curious (how curious?), that I'm going to take a 50 mile drive this morning to pick up a stripped down Cool Lemon SS frame I've been watching on FB Marketplace just to see what hides on it's underside. It also has a three piece bottom bracket adapter I want and I've talked them down to $20 so the cost is mostly in time/fuel. Thanks for your support!

The serial numbers actually tell you nothing at all about a build date of any Schwinn, frame or otherwise. The serial number only gives you the manufacturing date of the actual part that the serial number was stamped on. One extreme example are all the Schwinns with an MR serial number. During the strike Schwinn produced thousands of head tubes in Dec. 80 and there was no production for 13 weeks during the strike. Most all of these December 1980 head tubes were used throughout the 1981 production, and some have been seen on some 1982 models. There was a lightweight model that Schwinn produced two years after the serial dated part was made. I'm thinking it was 1977 model with 1975 serial numbers. If I remember correctly, this model was not in any customer catalogs.
 
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