These have been in the Japanese Sugino catalog since the early 70s at least.
I have bought a number of the chainrings on ebay over the years.
Joe Bender-Zanoni Great Notch, NJ
----- Original Message -----
From: Kurt Sperry
To: Kenneth Stagg
Cc: bobhoveyga@aol.com
Sent: Sunday, October 10, 2004 8:21 PM
Subject: Re: [CR]Re: Toei 50th Anniversary Specials
> < I wrote:>
> > OK, what is a "Pro Dynamic -S-" crankset, and who makes/made it?
>
> Did a little Googling, these are a Sugino-made near TA clone. I
> wonder what sorts of other cool bike stuff the Japanese make but won't
> bring into the US?
>
> Kurt Sperry
> Bellingham WA